(共30张PPT)
Unit
1
Nature
in
the
balance
Welcome
to
the
unit
&
Reading
Lead
in
Look
and
think
Presentation
Presentation
However,
it
is
a
totally
different
situation
in
some
other
places
!!!
Presentation
air
pollution
large-scale
construction
white
pollution
Let
us
not,
however,
flatter
ourselves
over
much
on
account
of
our
human
victories
over
nature.
For
each
such
victory
nature
takes
its
revenge
on
us.
—Friedrich
Engels
“但是我们不要过分陶醉于我们人类对自然界的胜利。对于每一次这样的胜利，自然界都对我们进行报复。”
——恩格斯
Welcome
to
the
unit
Listen
to
a
song!
Discussion
1.
What
is
the
message
of
the
song?
Humans
have
done
much
harm
to
the
Earth,
and
we
have
to
take
action
to
change
the
situation.
2.
What
can
we
do
to
help
protect
the
environment?
plant
more
trees
use
less
paper
drive
less
and
walk
more
use
fewer
plastic
bottles
and
bags
save
water
and
cut
down
the
use
of
electricity
don't
waste
food
don't
use
one-off
things
if
possible,
don't
use
air
conditioners
...
3.
How
do
you
understand
“harm”
and
“alarm”
?
“Harm”
means
something
bad
we
have
done
to
the
earth,
including
polluting
soils
and
seas,
cutting
down
too
many
trees,
etc.
“Alarm”
means
the
signal
that
warns
us
of
the
dangers
of
environmental
damage,
which
urges
us
to
find
a
solution.
Pre-reading
Do
you
know
where
it
is?
The
Amazon
rainforest:
a
natural
treasure
What
will
be
talked
about
in
the
text
according
to
the
title
and
the
picture?
What
could
be
the
genre（体裁）
of
the
article?
the
Amazon
rainforest
documentary
script
(纪录片脚本）
Prediction
Analysing
the
structure
Listen
to
complete
part
A1
on
page
4
with
the
main
idea
of
each
paragraph.
Para.
1:
Introduction
to
the
Amazon
rainforest
Para.
2:
Basic
information
about
the
rainforest
Para.
3:
_____________________________________
Para.
4:
______________________________________
Para.
5:
______________________________________
Plant
biodiversity：levels
of
the
rainforest（plants）
Animal
biodiversity：food
chain
（birds
and
animals）
The
rainforest’s
value
to
the
human
race;
threats
to
the
rainforest
Passage
Structure
Read
carefully
again
and
fill
in
the
blanks
with
the
figures.
8
6
million
6,400
40,000
1,300
400
20%
17%
What
is
the
purpose
of
using
so
many
figures?
To
support
the
statement
and
make
the
statement
more
persuasive
and
convincing;
to
make
the
facts
vivid
and
specific
by
making
comparisons
with
figures.
Read
para.
1
carefully
and
try
to
find
the
theme
of
the
script.
Find
a
sentence
to
match
the
picture
Read
paragraph
2
a
system
of
roots
The
forest’s
different
levels
support
an
unbelievable
variety
of
wildlife.
the
tops
of
the
tallest
trees
the
mass
of
leaf
litter
shorter
plants
with
large
leaves
towering
ancient
hardwoods
Read
Paragraph
3
and
complete
the
mind
map
about
different
levels
of
the
rainforest.
brazil
nut
water
lily
jaguars
insects
at
least
87
species,
including
frogs
leaves
and
fruit
microorganisms
feed
on
break
down
feed
on
feed
on
While
a
significant
number
of
jaguars
survive
here,
they
are
only
one
element
of
this
forest’s
food
chain.
nutrients
Read
para.
4
carefully
and
try
to
understand
the
food
chain.
Read
para.
5
carefully
and
try
to
understand
the
importance
and
danger.
1.
Why
does
the
Amazon
rainforest
play
a
significant
role
in
maintaining
the
balance
of
the
Earth's
ecosystem?
2.
Can
we
afford
to
damage
the
“lungs
of
the
planet”?
the
“lungs
of
the
planet”
a
treasure
house
of
species
for
food
and
medicine
materials
No.
The
Amazon
rainforest
is
far
too
important
for
us
to
allow
it
to
be
destroyed.
It
helps
maintain
the
balance
of
the
ecosystem
and
provides
our
society
with
food
and
medicine.
Language
practice
The
Amazon
rainforest
is
home
to
a
great
(1)
of
plant
life;
however,
its
soil
is
surprisingly
poor
in
nutrients.
In
fact,
the
soil
in
the
region
cannot
support
(2)
for
more
than
a
few
years.
If
a
scientist
is
shown
a
report
listing
the
nutrients
of
that
soil,
he
or
she
will
probably
think
that
only
desert
plants
can
(3)
in
it!
Then
why
is
the
soil
so
poor
in
nutrients?
For
one
thing,
the
rainy
season
has
a(n)
(4)
on
the
soil.
In
the
rainy
season,
the
water
level
can
rise
to
as
high
as
12
metres.
When
the
water
goes
away,
it
takes
away
the
nutrients
in
the
soil.
For
another
thing,
B1
variety
agriculture
survive
impact
(5)
the
Amazon’s
hot
climate,
it
is
difficult
for
the
soil
to
build
up
enough
nutrients.
Dead
plants
and
animals
(6)
more
quickly.
The
nutrients
are
soon
taken
in
by
the
roots
of
the
plants
deep
(7)
the
ground.
As
a
result,
most
of
the
forest’s
nutrients
are
locked
up
in
the
plants
themselves,
(8)
_____
allowing
them
to
grow
at
an
unbelievable
speed.
due
to
are
broken
down
beneath
thus
Words
formed
with
negative
prefixes
B2
Prefixes
Words
un-
dis-
in-/im-/il-/ir
non-
unbelievable,
unlimited,
unhappy,
unknown,
unusual,
unreal,
unfortunate,
unlucky,
unkind
disappear,
disagree,
disadvantage,
dissatisfied,
dishonest,
disabled
irreplaceable,
invisible,
incorrect,
inactive,
independent,
impolite,
imbalance,
illegal,
irregular,
irresponsible
non-smoking,
non-stop,
non-existent,
non-profit,
non-fiction
Language
rule
You
will
be
__________
(able)
to
pass
the
exam
if
you
don’t
study
hard.
If
someone
doesn’t
show
good
manners
to
others,
he
is
__________
(polite).
Simon
is
such
a(n)
__________
(honest)
person
that
no
one
believes
him.
It
is
so
__________
(fair).
Mary
gets
more
money
for
less
work.
They
looked
poor
and
__________
(healthy).
Would
you
let
other
people’s
__________
(sense)
change
your
mood?
Most
of
that
money
goes
to
__________
(profit)
organizations
that
run
programmes
for
the
poor.
It
is
__________
(friendly)
of
him
to
say
such
bad
words
to
his
classmates.
unfriendly
impolite
dishonest
unfair
unhealthy
nonsense
non-profit
unable
Fill
in
the
blanks
with
words
with
negative
prefixes.
Homework
1.
Write
a
summary
of
the
script
based
on
the
chart
discussed
in
class.
2.
Finish
the
workbook.
