(共22张PPT)
SPACE
EXPLORATION
Period
3
Reading
and
Thinking
---Language
points
1.
To
practice
the
usage
of
some
words
and
phrases
learnt
in
this
unit
by
completing
a
passage;
2.
To
consolidate
the
understanding
of
the
article;
3.
To
reflect
what
you
have
learnt
in
this
class;
By
the
end
of
this
period,
you
will
be
able
to
Teaching
objectives
Review
“Are
we
alone?
What’s
out
there?”
Looking
up
at
the
stars,
people
have
always
wanted
to
learn
more
about
space,
and
scientists
work
hard
to
find
answers.
They
make
vehicles
to
carry
brave
people
into
space
to
find
out
the
secrets
of
the
universe.
They
also
really
wish
to
discover
other
planets
that
are
suitable
enough
to
support
life.
The
_________
to
explore
the
outer
space.
Para.
1
desire
Review
Earlier
______________
of
space
exploration.
Before
the
mid-20th
century,
most
people
felt
travelling
into
space
was
an
impossible
dream.
However,
some
scientists
were
determined
to
help
humans
realise
their
dream
to
explore
space.
After
many
experiments,
they
succeeded
in
making
rockets
that
could
escape
Earth’s
gravity.
On
4
October
1957,
the
Sputnik
1
satellite
was
launched
by
the
USSR
and
successfully
orbited
around
Earth.
Afterwards,
the
USSR
focused
on
sending
people
into
space,
and
on
12
April
1961,
Yuri
Gagarin
became
the
first
person
in
the
world
to
go
into
space.
Over
eight
years
later,
on
20
July
1969,
American
astronaut
Neil
Armstrong
stepped
onto
the
moon,
famously
saying,
“That’s
one
small
step
for
[a]
man,
one
giant
leap
for
mankind.”
Following
this,
many
more
goals
were
achieved.
For
example,
America’s
NASA
space
agency
launched
Voyager
1
on
5
September
1977
to
study
deep
space,
and
it
still
transmits
data
today.
Para.
2
achievements
Review
Continuous
________
despite
the
huge
risks.
Although
scientists
try
to
make
sure
nothing
goes
wrong,
accidents
can
still
happen.
All
the
astronauts
on
the
USSR’s
Soyuz
11
and
America’s
Challenger
died
during
their
missions.
These
disasters
made
everyone
sad
and
disappointed,
but
the
desire
to
explore
the
universe
never
died.
This
is
because
people
believe
in
the
importance
of
carrying
on
space
exploration
despite
the
huge
risks.
An
example
of
this
ongoing
work
is
the
International
Space
Station.
It
orbits
Earth
and
has
astronauts
from
different
countries
on
board,
providing
a
continuous
human
presence
in
space.
Para.
3
effort
Review
Great
__________
of
China’s
space
exploration.
China’s
space
programme
started
later
than
those
of
Russia
and
the
US,
but
it
has
made
great
progress
in
a
short
time.
China
became
the
third
country
in
the
world
to
independently
send
humans
into
space
in
2003,
when
Yang
Liwei
successfully
orbited
Earth
in
the
Shenzhou
5
spacecraft.
Then
Shenzhou
6
and
7
completed
a
second
manned
orbit
and
the
first
Chinese
spacewalk,
followed
by
the
vehicle
Jade
Rabbit
being
sent
to
the
moon
to
study
its
surface.
After
that,
China
launched
the
Tiangong
2
space
lab
into
space
and
Tianzhou1
to
dock
with
it.
This
signalled
one
step
further
in
China’s
plan
to
establish
a
space
station
in
the
future.
More
recently,
China
has
sent
Chang’e
4
to
explore
the
surface
of
the
far
side
of
the
moon
to
make
measurements
and
observations.
Para.
4
progress
Recite
China’s
...
...
started
later
than
those
of
...
...and
...
...,
but
it
...
...in
a
short
time.
China
became
...
...
country
in
the
world
to
...
...into
space
in
2003,
when
Yang
Liwei
...
...
Earth
in
the
Shenzhou
5
...
...Then
Shenzhou
6
and
7
...
...
a
second
manned
orbit
and
the
first
Chinese
...
...,
...
...
the
vehicle
Jade
Rabbit
being
sent
to
the
moon
to
...
...
After
that,
China
...
...
the
Tiangong
2
space
lab
into
space
and
Tianzhou1
to
...
...
it.
This
...
...
in
China’s
plan
to
...
...
in
the
future.
More
recently,
China
has
sent
Chang’e
4
to
...
...
the
surface
of
the
far
side
of
the
moon
to
...
...
Review
The
future
of
space
exploration
remains
bright.
Europe,
the
US,
and
China
all
have
plans
to
further
study
and
explore
planets
like
Mars
and
Jupiter.
Despite
the
difficulties,
scientists
hope
future
discoveries
will
not
only
enable
us
to
understand
how
the
universe
began,
but
also
help
us
survive
well
into
the
future.
Para.
5
Bright
__________
of
space
exploration.
future
Watch
and
think
The
process
of
China’s
space
explorations
is
hard.
Thanks
to
scientists’
devotion
and
contributions,
we
have
gained
remarkable
and
surprising
achievements.
“飞天，乃是我中华千年之夙愿。今天，我纵然粉身碎骨，血溅天僵，也要为后世闯出一条探天地道路来！”
---《万户飞天》
REC
HD
4K
25FPS
MENU
Now,
there
is
an
activity
titled
“
I
say
something
to
CNSA.”
As
a
teenager,
what
would
you
say
and
why
do
you
say
so?
Language
appreciation
仰望
下决心做
实现梦想
探索太空
成功做
集中于
登上月球
实现目标
传输数据
继续做
在船上
取得巨大进步
在短时间内
使某人能够做
look
up
be
determined
to
do
realise
one’s
dream
explore
space
succeed
in
doing
focus
on
step
onto
the
moon
achieve
one’s
goal
transmit
data
carry
on
doing
on
board
make
great
prgress
in
a
short
time
enable
sb.
to
do
Mini
test
1.
His
eyes
slowly
bagan
to
____
____
what
looked
like
a
small
dark
ball.
2.
You
will
wear
yourself
out
if
you
______
____
working
so
hard.
3.
Thomas
was
__________
____
become
a
world-class
football
player.
4.
They
might
well
be
prepared
to
do
you
harm
in
order
to
_______
_______
______.
5.
There
is
a
new
programme
which
aims
at
_________
older
people
to
study
at
college.
6.
Hard
work
is
the
key
of
the
game
if
you
want
to
_______
___
business.
7.
We’ve
_______
great
_________
in
social
justice
and
equality.
focus
on
carry
on
determined
to
achieve
their
goal
enabling
succeed
in
made
progress
Language
appreciation
1.
Looking
up
at
the
stars,
people
have
always
wanted
to
learn
more
about
space,
and
scientists
work
hard
to
find
answers.(Para.
1)
2.
Afterwards,
the
USSR
focused
on
sending
people
into
space,
and
on
12
April
1961,
Yuri
Gagarin
became
the
first
person
in
the
world
to
go
into
space.(Para.
2)
3.
Following
this,
many
more
goals
were
achieved.(Para.
2)
4.
Then
Shenzhou
6
and
7
completed
a
second
manned
orbit
and
the
first
Chinese
spacewalk,
followed
by
the
vehicle
Jade
Rabbit
being
sent
to
the
moon
to
study
its
surface.(Para.
4)
5.
This
is
because
people
believe
in
the
importance
of
carrying
on
space
exploration
despite
the
huge
risks.(Para.
3)
6.
It
orbits
Earth
and
has
astronauts
from
different
countries
on
board,
providing
a
continuous
human
presence
in
space.(Para.
3)
7.
China
became
the
third
country
in
the
world
to
independently
send
humans
into
space
in
2003,
when
Yang
Liwei
successfully
orbited
Earth
in
the
Shenzhou
5
spacecraft.(Para.
4)
Language
appreciation
1.
Looking
up
at
the
stars,
people
have
always
wanted
to
learn
more
about
space,
and
scientists
work
hard
to
find
answers.
6.
It
orbits
Earth
and
has
astronauts
from
different
countries
on
board,
providing
a
continuous
human
presence
in
space.
V-ing作时间状语
V-ing作结果状语
仿写：
听到这个消息，他们都高兴地跳了起来。（hear)
大火持续了一整夜，造成了巨大损失。（cause)
Hearing
the
news,
they
all
jumped
with
joy.
The
big
fire
lasted
a
whole
night,
causing
great/huge
damage.
Language
appreciation
2.
Afterwards,
the
USSR
focused
on
sending
people
into
space,
and
on
12
April
1961,
Yuri
Gagarin
became
the
first
person
in
the
world
to
go
into
space.(Para.
2)
7.
China
became
the
third
country
in
the
world
to
independently
send
humans
into
space
in
2003,
when
Yang
Liwei
successfully
orbited
Earth
in
the
Shenzhou
5
spacecraft.(Para.
4)
结构：the+序数词+n.+to
do
(不定式作定语)
含义：第几个做某事的……
（不定式所修饰的名词或代词前面常有only,
first,
last,
next或序数词、形容词最高级等修饰）
I
am
always
the
first
person
________
to
the
office.
我总是第一个到达办公室的人。
He
is
always
the
first
_________
and
the
last
to
leave.
他总是第一个来,
最后一个走。
to
get
to
come
Language
appreciation
3.
Following
this,
many
more
goals
were
achieved.(Para.
2)
4.
Then
Shenzhou
6
and
7
completed
a
second
manned
orbit
and
the
first
Chinese
spacewalk,
followed
by
the
vehicle
Jade
Rabbit
being
sent
to
the
moon
to
study
its
surface.(Para.
4)
V-ing作伴随状语
Vpp作伴随状语
例：
1.
__________
Miss
Li,
I
went
into
the
meeting
room.
2.
__________
by
some
boys,
the
teacher
went
into
the
classroom.
Following
Followed
Language
appreciation
5.
This
is
because
people
believe
in
the
importance
of
carrying
on
space
exploration
despite
the
huge
risks.(Para.
3)
because引导的是表语从句，后接原因。
It/This/That
is/was
because…它/这/那是因为……
翻译：
她总是不快乐。这是因为她要求很高。
She
is
always
unhappy.
This
is
because
she
is
rather
demanding.
Practice
M
_______
is
exploring
space
in
the
hope
of
finding
out
more
about
the
u_______.
However,
exploring
space
is
both
dangerous
and
challenging.
One
of
the
most
dangerous
parts
of
space
exploration
is
helping
people
to
escape
Earth’s
g______.
If
there
is
a
mistake
during
the
I______,
it
can
lead
to
an
accident
that
kills
everyone
on
b_______.Getting
out
of
o_____
and
back
to
Earth’s
surface
is
also
very
dangerous.
Despite
the
huge
risks
though,
people
will
always
continue
to
explore
this
final
f_______
so
as
to
learn
its
secrets.
ankind
niverse
ravity
aunch
oard
rbit
rontier
Lee
was
busy
at
work.
Unlike
most
people
around
the
world
though,
his
workplace
was
in
space.
There
was
a
problem
with
a(n)
________.
It
was
supposed
to
send
information
about
the
sun
back
to
the
________
on
Earth,
but
the
equipment
for
sending
the
_____
was
not
working
properly.
So
it
was
Lee's
mission
to
________
the
problem
and
solve
it.
Lee
was
very
_________
as
a(n)
__________,
and
he
was
also
very
careful.
He
was
__________
to
make
the
satellite
work
properly
again,
but
he
would
make
sure
to
be
safe.
He
knew
that
one
small
mistake
could
________
death.
agency
astronaut
data
determined
intelligent
satellite
figure
out
result
in
satellite
agency
data
Practice(P46)
figure
out
intelligent
astronaut
determined
result
in
Search
online
or
in
the
library
for
information
about
China’s
achievements
in
space
exploration,
especially
the
important
technological
breakthroughs
and
space
missions.
Organize
the
information
into
a
table
like
the
one
below.
Homework
THANKSLiving
in
Space
1
Living
in
space
is
not
the
same
as
living
on
Earth.
Many
things
are
different.
Our
bodies
change
in
space.
The
way
we
stay
clean
and
neat
is
different
too.
Learn
how
astronauts
stay
strong,
clean
and
neat.
Staying
Strong
Living
in
space
is
not
the
same
as
living
on
Earth.
In
space,
astronauts'
bodies
change.
On
Earth,
our
lower
body
and
legs
carry
our
weight.
This
helps
keep
our
bones
and
muscles
strong.
In
space,
astronauts
float.
They
do
not
use
their
legs
much.
Their
lower
backs
begin
to
lose
strength.
Their
leg
muscles
do
too.
The
bones
begin
to
get
weak
and
thin.
This
is
very
bad
for
astronauts'
bodies.
So,
how
do
astronauts
help
their
muscles
and
bones?
They
must
exercise
in
space
every
day.
The
heart
and
blood
change
in
space,
too.
When
we
stand
up
on
Earth,
blood
goes
to
our
legs.
The
heart
has
to
work
extra
hard
against
gravity
to
move
the
blood
all
around
the
body.
In
space,
without
the
pull
of
gravity,
the
blood
moves
to
the
upper
body
and
head.
Water
in
the
body
also
does
the
same
thing.
It
makes
the
astronauts'
faces
look
puffy.
The
blood
and
water
are
fluids
in
the
body.
These
fluids
move
from
the
bottom
of
the
body
to
the
top.
The
brain
thinks
that
there
are
too
many
fluids.
It
will
tell
the
body
to
make
less.
When
the
astronauts
come
back
to
Earth,
they
do
not
have
enough
fluids
in
their
systems.
It
takes
their
bodies
a
few
days
to
make
more
blood
and
water.
The
astronauts
have
to
rest
so
their
bodies
have
time
to
make
new
blood
and
water.
If
they
don't,
they
can
feel
very
weak.
They
might
even
faint!
Staying
Clean
On
Earth,
people
need
to
stay
clean.
In
space,
astronauts
need
to
stay
clean,
too.
Staying
clean
takes
more
work
in
space.
In
space,
the
astronauts
do
not
have
a
bathroom
as
we
have
at
home.
But,
they
do
have
their
own
toothbrushes,
toothpaste,
combs,
brushes,
and
shavers.
These
are
kept
in
a
Personal
Hygiene
Kit.
Astronauts
use
toothpaste
and
toothbrushes
just
like
yours.
There
is
no
sink
like
yours
on
the
Space
Shuttle,
though.
Astronauts
have
to
spit
into
a
washcloth.
People
take
baths
a
different
way
in
space,
too.
Astronauts
use
special
kinds
of
soap
and
shampoo.
These
soaps
do
not
need
water
to
rinse.
Astronauts
must
use
them
carefully.
They
do
not
let
the
soap
bubbles
go
all
over
the
place.
After
washing,
they
use
a
towel
to
dry
off.
They
do
not
rinse.
These
special
soaps
and
shampoos
were
made
for
hospitals.
Patients
who
cannot
get
in
the
water
use
these
soaps.
Staying
Neat
Doing
chores
is
not
always
a
fun
thing.
But
we
have
to
keep
our
rooms
and
houses
clean
and
neat.
In
space,
astronauts
live
in
a
very
small
space.
They
have
to
keep
their
area
clean
in
space
just
like
we
do
on
Earth.
In
space,
the
astronauts
wipe
the
walls,
floors,
and
windows
to
keep
them
clean.
They
use
a
soap
that
kills
germs.
The
astronauts
also
use
wet
wipes
to
wash
things.
They
use
the
same
kind
of
wipes
and
cleanser
on
their
forks,
spoons,
and
eating
trays.
Astronauts
have
to
take
out
the
garbage,
too.
There
are
four
trash
bins
on
the
Space
Shuttle.
Three
are
for
dry
trash
and
one
is
for
wet
trash.
Wet
trash
is
anything
that
could
smell
bad.
Each
trash
container
has
a
trash
liner
placed
inside.
It
is
like
a
plastic
garbage
bag.
If
the
liner
becomes
full,
it
is
closed.
Then
it
is
moved
far
away
from
the
astronauts.
The
wet
trash
is
closed
up
tight.
It
is
then
connected
to
a
hose.
The
hose
helps
move
bad
smells
away
from
the
astronauts.
Astronauts
must
use
a
vacuum
cleaner
in
space.
The
vacuum
has
a
normal
hose.
It
also
has
extra
parts.
These
parts
can
clean
areas
that
may
be
hard
to
reach.
They
also
use
it
to
keep
dust
out
of
the
air
filters.
And
sometimes
things
get
loose.
When
things
get
loose,
they
float.
Astronauts
use
the
vacuum
to
"catch"
floating
objects
that
are
out
of
their
reach.
Living
in
Space
2
During
their
stay
on
the
International
Space
Station
(ISS)
astronauts
have
to
continue
living
and
working
in
an
environment
that
is
very
different
to
that
here
on
Earth.
They
still
need
to
keep
clean,
go
to
the
bathroom,
eat
and
drink
and
keep
fit
and
healthy.
The
conditions
of
weightlessness
on
the
ISS
mean
they
need
to
adapt
these
activities.
The
ISS
is
orbiting
400
kilometres
from
Earth
and
everything
needs
to
be
taken
there
from
Earth.
This
means
that
the
astronauts
have
to
conserve
resources
such
as
water
and
food
and
waste
needs
to
be
kept
to
a
minimum.
In
this
series
of
video
clips,
ESA
astronaut
Frank
De
Winne
and
some
of
his
fellow
crew
members,
explain
how
they
live
on
board
the
International
Space
Station.
Attached
to
these
video
clips
(filmed
during
the
OasISS
mission)
are
some
short
lessons
that
educators
can
use
in
the
classroom.
Personal
Hygiene
Whether
you
are
at
home,
school
or
vacation
one
thing
you
will
need
to
do
everyday
is
to
look
after
your
personal
hygiene.
What
does
this
mean?
Well,
washing
yourself,
brushing
your
teeth,
using
the
toilet
and
even
putting
on
reasonably
fresh,
clean
clothes.
Even
on
the
International
Space
Station
(the
ISS),
astronauts
need
to
carry
out
personal
hygiene.
In
such
a
small
space
that
you
have
to
share
with
up
to
13
people
at
times,
things
can
become
very
unpleasant
if
someone
is
not
taking
care
of
business!
Lets
start
with
the
hygiene
basics:
Teeth
Why
do
we
have
teeth
and
what
do
they
do?
How
to
take
care
of
our
teeth?
Why
is
this
important?
Write
down
all
the
reasons
why
you
think
teeth
are
useful.
Take
a
mirror
and
have
a
good
look
at
your
teeth.
How
many
different
kinds
of
teeth
can
you
see
and
feel?
Sharp
teeth
in
the
front
of
your
mouth
are
called
incisors.
Pointed
teeth
next
to
them
are
called
canines
and
the
wider
teeth
with
bumps
are
called
molars.
Count
how
many
teeth
you
have.
Draw
a
picture
of
your
teeth
as
you
can
see
from
the
mirror.
Experiment:
effect
of
fizzy
drinks
on
teeth
If
you
have
a
tooth
that
has
fallen
out
–
like
a
milk
tooth
–
place
it
in
a
glass
with
cola
or
another
fizzy
drink
you
normally
would
drink.
Keep
looking
at
it
everyday
for
a
week.
What
happens
to
it?
Make
a
picture
of
the
tooth
before
and
after
it
has
been
in
the
drink.
Do
you
know
why
it
changes?
Can
you
think
why
it
is
important
to
limit
how
much
fizzy
drinks
you
consume?
What
is
in
the
‘fizz’
of
the
drink
that
spoils
the
tooth?
Why
do
we
use
toothpaste?
How
often
do
you
need
to
brush
your
teeth
with
toothpaste?
Answers:
There
are
about
20-25
teeth
in
the
mouth
of
most
young
children.
Brushing
teeth
is
important
to
prevent
tooth
decay
and
bad
breath.
If
you
stop
brushing
teeth
your
mouth
will
smell
and
your
teeth
will
begin
to
hurt
and
develop
cavities.
Fizzy
drinks
are
acidic
which
can
damage
the
enamel
of
the
tooth.
Brushing
your
teeth
after
meals
with
fluoride
toothpaste
can
help
prevent
tooth
decay
and
strengthen
teeth.
It
also
makes
your
mouth
smell
fresh!
When
you
wake
up
in
the
morning,
one
of
the
first
things
you
do
is
brush
your
teeth.
Why
do
you
need
to
do
this?
When
you
eat,
some
of
the
sugar
in
the
food
stays
in
your
mouth.
Bacteria
feed
on
this
sugar
and
make
acid.
This
acid
dissolves
the
enamel
of
your
tooth
and
can
cause
tooth
decay
(cavities)
-
this
hurts
(tooth
ache)!
You
need
to
see
a
dentist
regularly
to
check
this
does
not
happen.
Everyone
needs
to
keep
their
teeth
healthy
and
clean
-
even
astronauts
in
space
-
the
dentist
is
very
far
away
if
they
develop
tooth
ache!
In
Space
Astronauts
brush
their
teeth
in
the
normal
way
as
you
do,
but
there
is
a
difference!
In
the
first
video
clip,
look
at
how
everything
‘floats’
around.
This
is
because
on
the
ISS
there
is
no
weight
pulling
things
downwards
like
on
earth.
The
Space
Station
is
orbiting
the
Earth
so
fast
(28000
kilometres
per
hour)
at
the
correct
speed
and
direction;
it
does
not
fall
down
to
Earth
but
keeps
falling
around
the
Earth.
Because
it
is
falling
everything
inside
it
is
weightless.
So
everything
floats!
Even
water
and
toothpaste.
The
toothpaste
astronauts
use
can
be
swallowed
after
brushing
(edible
toothpaste)
and
the
mouth
is
then
cleaned
with
a
wet
wipe.
The
astronauts
have
to
brush
with
their
mouth
as
closed
as
possible
to
prevent
the
toothpaste
floating
out!
Going
to
the
bathroom
on
the
ISS
So
if
everything
‘floats’
in
space,
then
how
do
you
go
to
the
toilet?
There
is
a
special
toilet
on
the
ISS
(situated
on
the
Russian
module
Zvezsda).
There
will
be
another
one
which
will
be
situated
on
the
American
module
–
as
the
number
of
crew
on
the
ISS
will
go
up.
The
astronauts
have
to
strap
themselves
in
to
prevent
floating
off.
Instead
of
a
flush
toilet
there
is
a
suction
tube
which
carries
the
waste
away
in
an
air
stream
down
a
hole.
The
solid
gets
compressed
and
stored
for
disposal
later.
The
urine
is
connected
and
later
recycled.
Certainly
a
strange
way
to
go
to
the
bathroom!
Eating
and
drinking
on
the
ISS
As
well
as
exercise,
nutrition
plays
an
important
role
in
maintaining
the
health
of
the
astronauts.
Food
is
not
just
used
for
providing
sufficient
number
of
calories
for
working
but
meal
times
are
important
social
occasions
for
people
so
far
away
from
their
families
and
friends.
The
food
is
specially
prepared
because
weightlessness
requires
adjustments
to
prevent
the
food
from
floating
off
a
plate.
Some
types
of
food
must
also
be
eaten
to
counter
the
effects
of
adaptation
to
the
space
environment.
Astronauts
get
to
choose
which
meals
they
would
like
so
long
as
the
nutritional
values
and
calories
are
kept
within
the
approved
requirements:
2800
calories
per
day.
The
food
trays
are
prepared
on
the
ground
for
each
astronaut
and
delivered
to
the
ISS
before
he/she
arrives.
These
are
stored
in
one
of
the
modules
and
marked.
Red
food
trays
contain
foods
from
Russia
and
blue
trays
contain
food
from
the
American/European
countries.
The
food
has
to
be
specially
treated
so
that
it
can
last
a
long
time
and
is
low
in
mass.
Space
food
There
are
several
types
of
food
that
is
eaten
in
space:
Rehydratable
food:
Water
is
removed
to
make
food
easier
to
store.
Also
known
as
freeze-drying.
On
board,
water
is
replaced
in
the
foods
before
eaten.
Items
include
beverages
(tea,
coffee,
orange
juice)
and
cereals
such
as
oats.
Thermo
stabilised
food:
heat
processed
food
which
can
then
be
stored
at
room
temperature.
Most
of
the
fruits
and
fish
(tuna)
are
prepared
in
cans
with
easy
pull
tabs.
Desserts
are
packaged
in
plastic
cups.
Irradiated
foods:
Most
of
the
beef
products
are
cooked
and
packaged
in
flexible
foil
pouches
and
sterilized
by
ionising
radiation
so
they
can
be
kept
at
room
temperature.
Fresh
foods:
such
as
apples
and
bananas
–
often
fresh
supplies
are
brought
up
by
new
crews.
Natural
form
foods:
such
as
nuts
and
cookies.
Astronauts
use
the
trays
as
plates
and
everything
has
to
be
either
squeezed
out
of
a
tube
or
bag.
Can
you
imagine
what
would
happen
if
the
drink
and
crumbs
were
allowed
to
escape
and
floated
wherever
they
wanted?
Look
at
all
the
electric
equipment
around…
yes,
disaster!
It
is
very
expensive
to
carry
all
this
mass
on
to
the
station
so
everything
has
to
be
very
light
and
easily
stored.
Exercise
and
Fitness
The
human
body
evolved
on
Earth,
in
a
gravity
field.
Absence
of
weight
leads
to
health
problems
such
as
bone
and
muscle
loss.
Weightlessness
also
makes
it
harder
to
do
even
small
tasks.
The
astronauts
have
to
anchor
themselves
firmly,
or
they
would
drift
away
-
even
using
the
computer
becomes
difficult.
Space
walks
can
be
exhausting
and
put
unusual
strain
on
muscles.
This
means
that
astronauts
have
to
take
time
to
exercise
and
keep
themselves
fit
and
healthy
to
carry
out
their
job
on
the
ISS
and
to
return
to
Earth
in
good
shape.
On
board
there
is
a
treadmill
and
an
exercise
bicycle
(without
tyres!).
Astronauts
have
to
do
at
least
2
hours
of
exercise
per
day
to
keep
in
good
shape.
There
are
also
various
pulleys
and
ropes
which
are
similar
to
a
gym
on
earth
where
they
can
do
resistance
training
all
which
help
maintain
the
condition
of
their
bones
and
muscles
–
also
very
important
as
when
they
return
back
to
gravity
on
Earth
their
physical
condition
is
maintained
as
good
as
possible.
