Unit
8
Discoveries
Lesson
21
Famous
Discoveries
教材分析
Lesson
22是一节阅读课，涉及的话题是Famous
discovery。第一发现是抗生素，它在现实生活中作用比较大，但要注意适当使用。第二发现是DNA，文本中介绍了它的架构，同时通过这个我们可以获知孩子从父母那遗传了哪些基因，同时也能在医学界可以帮助治疗很多疾病。第三个发现是X光射线，介绍了它的发明人及它的作用，在生活中人们把它用到了各行各业中。通过文本学习，使学生了解这些方面的知识，在生活中能够解决一些小问题。
教学目标
【知识目标】
通过对文本的理解与参与活动1，感知条件状语从句的意义。
【能力目标】
通过阅读文本，表达出这些发现在现实生活中的所起的作用，了解一些简单的医学常识。
【情感目标】
通过本节课的学习，使学生了解到需要长久不懈的努力和坚持，才能有所发现，有所成就。、
重点难点
【教学重点】
通过阅读文本，获取有关three
discoveries的名称、发明人及用途等基本信息。
【教学难点】
运用所学内容，就这些著名发现来谈论它们在现实生活中的所起的作用，了解一些简单的医学常识。
课前准备
1.
课前准备：调试光盘与课件、给学生分组、为学生布置预习作业等；
2.
教具学具：光盘、大卡片等。
教学过程
Step1.
Warm-up
1.
Let
students
talk
about
the
astronomic
knowledge.
2.
Let
students
make
a
discussion
on
the
astronomic
discoveries.
What
are
the
people
doing
in
the
following
pictures?
What
do
you
think
they
are
trying
to
discover?
3.
Listen
to
and
practice
the
key
words
related
to
discovery.
chemistry,
do
experiments,
electricity,
health,
lab,
machine,
observe,
physics,
research,
space,
technology
4.
Take
a
look
at
pictures
and
learn
famous
discoverer.
Step2.
Reading
1.
Look
the
photos
of
figures
who
made
the
three
discoveries
and
introduce
their
discoveries.
2.
Read
and
find
the
name
of
the
picture
A,
B
and
C
and
make
sure
whether
your
match
is
right
or
not.
3.
Let
students
find
out
when
these
discoveries
took
place.
Write
the
correct
years.
4.
Scan
and
find
out
the
main
contents
presented
in
the
passage.
5.
Finish
them
on
the
worksheet
to
answer
the
following
questions.
Step3.
Language
points
cure
vt.
治愈；
矫正；
解决；
消除
He
needed
surgery
to
cure
a
troublesome
back
injury.
2.
block
n.
块；
街区；
障碍物，阻碍
She
walked
four
blocks
down
High
Street.
There
is
a
block
of
ice.
3.
pass
on
传递；
去世；
前进；
对…发表（意见）
He
has
written
a
note
asking
me
to
pass
on
his
thanks.
4.
treat
v.
对待；
治疗；
处理；
款待
Doctors
treated
her
with
aspirin.
Step4.
Pair
work
1.
Students
pretend
to
be
a
doctor
and
treat
the
various
cases.
2.
Ask
students
to
discuss
which
discovery
is
the
most
important
according
to
the
text.
3.
Let
students
share
with
their
ideas
of
discoveries.
Step5.
Homework
1.
Finish
Exercise
book.
2.
If
you
live
in
school
or
travel
around
for
more
than
10
days,
what
will
you
take
in
your
medicine
bag（急救包）?
Discuss
with
your
partner,
and
write
down
on
the
worksheet.(共26张PPT)
Unit
8
Lesson
22
Famous
Discoveries
Have
you
seen
this
picture?
What’s
this?
Warm-up
NASA?on?23rd,
July?announced?the?discovery?
of?Kepler-452b,?the?most?Earth-like?planet?
ever
found.?Located?1,400?light-years?from?
our?planet,?NASA?called?it
“Earth?2.0”,?
because?it’s?the
first?planet?discovered?in?the?
habitable?zone?of?a?G?star?similar?to?our?sun.
7月23日，美国国家航空航天局(简称为NASA)宣布发现开普勒-452b，是迄今为止与地球最为相近的行星。该行星距离地球1400光年，NASA将其命名为“地球2.0”，因为它是第一颗人类在宜居带里与太阳相似的恒星附近发现的行星。
1.与太阳相似的恒星被发现
这颗系外行星编号Kepler
452b，其直径约为地球的1.6倍，与恒星之间的距离与日-地距离相近。恒星Kepler
452距离地球大约430秒差距(约合1400光年)，位于天鹅座。
天文学家称，这是至今为止发现的最接近地球的“孪生星球”，跟地球的相似指数为0.98，并且有可能拥有大气层和流动水。
NASA说这个星球上可能有活火山，有存在生命的可能性，行星应该有60亿年历史，地球为45亿年。
An
international
team
of
scientists
said
they
have
discovered
the
farthest
galaxy
ever
measured
in
the
universe.
By
using
a
powerful
instrument
called
MOSFIRE
on
the
Keck
I
telescope
at
the
Keck
Observatory
in
Hawaii,
the
team
thought
that
the
galaxy,
EGS-zs8-1,
formed
more
than
13
billion
years
ago
at
a
time
when
the
universe
was
only
five
percent
of
its
present
age.
科学家使用位于夏威夷的凯克天文台的望远镜发现了新星系，并将这个星系命名为EGS-zs8-1。它是迄今发现的最遥远星系，打破了此前的观测纪录。
2.宇宙中最遥远星系被发现
What
are
the
people
doing
in
the
following
pictures?
What
do
you
think
they
are
trying
to
discover?
Discussion
Example:
I
think
the
person
in
Photo
A
is
observing
the
stars.
Maybe
he
is
trying
to
discover
a
new
star.
Key
Words:
Discoveries
chemistry,
do
experiments,
electricity,
health,
lab,
machine,
observe,
physics,
research,
space,
technology
Listen
and
practice.
1.Do
you
know
any
other
scientific
discoveries?
2.Can
you
name
some
famous
ones?
3.
Among
these
discoveries,
which
do
you
think
are
the
most
important
ones?
Free
Talk
Look
at
your
worksheet
after
class.
PPT(26—32)
Do
you
know
any
of
them?
What’s
their
major
achievements?
Tu
Youyou
has
become
the
first
Chinese
woman
to
win
a
Nobel
Prize(2015),
for
her
work
in
helping
to
create
an
anti-malaria
(['?nti?m?l'e?ri?]
抗疟疾的
)
medicine.
屠呦呦
(1930--)药学家
抗疟疾:青蒿素和双氢青蒿素
Reading
and
match
2.
Many
children
died
very
young
because
of
different
diseases.
Now
it
can
be
cured(治愈)
easily
with
it.
Look
!
Guess
1.
It’s
a
discovery
in
physics（身体）.
It
can
go
right
through
some
things
like
skin(皮肤）
and
wood
but
stop
by
bones
or
metal.
3.
It’s
the
building
block
of
life
and
we
know
a
great
deal
about
what
we
get
from
our
parents
from
it.
A
B
C
Read
and
find
the
name
of
the
picture
A,B
and
C
and
make
sure
whether
your
match
is
right
or
not.
X-ray
DNA
antibiotics
The
first
antibiotic:
Penicillin
青霉素，盘尼西林
It
can
wipe
out
the
infection消除感染
Alexander
Fleming亚历山大·弗莱明
Event
Year
The
structure
of
DNA
was
discovered.
Wilhelm
Roentgen
received
the
Nobel
Prize.
Scientists
discovered
DNA.
1953
When
did
these
things
happen?
Write
the
correct
years.
1901
1869
DNA
structure
double
coiled
spiral
structure
(双线圈螺旋结构）
Crick
Watson
克里克
沃森
Wilhelm
Roentgen
X-ray
1845---1923Germany
威廉·伦琴
What
effect
do
these
discoveries
have?
discoveries
effect
Antibiotics
DNA
X-rays
A
lot
of
diseases
can
be
cured
easily
with
it.
pass
on
certain
characteristics,
be
able
to
treat
more
disease.
Doctors
treat
broken
bones
easily
with
X-rays
machines.
Three
discoveries
DNA
(Crick
&
Watson)
X-rays
(Wilhelm
Roentgen)
1.
the
building
block
of
life
2.
pass
on
certain
characteristics
3.
be
able
to
treat
more
disease
Doctors
treat
broken
bones
easily
with
X-rays
machines.
The
text
is
about…
A
lot
of
diseases
can
be
cured
easily
with
it.
Antibiotics
(Fleming)
effect
Can
you
answer
these
questions?
Finish
them
on
the
worksheet.
1.
What
can
cure
a
lot
of
diseases
easily?
What
passed
on
certain
characteristics
from
parents
to
children?
3.
What
can
scientists
know
from
the
map
of
our
DNA?
4.
Who
was
the
first
to
study
and
name
X-ray?
5.
What
prize
did
the
discoverer
of
X-ray
award?
Answer
the
following
questions
Antibiotics,
X-rays.
(DNA,
maybe
in
the
future.)
1.
What
can
cure
a
lot
of
diseases
easily?
2.
What
passed
on
certain
characteristics
from
parents
to
children?
3.
What
can
scientists
know
from
the
map
of
our
DNA?
DNA.
It
tells
them
a
great
deal
about
what
get
from
our
parents.
4.
Who
was
the
first
to
study
and
name
X-ray?
5.
What
prize
did
the
discoverer
of
X-ray
award?
Wilhelm
Roentgen.
The
first-ever
Nobel
Prize
in
Physics.
1.
cure
vt.
治愈；
矫正；
解决；
消除
He
needed
surgery
to
cure
a
troublesome
back
injury.
2.
block
n.
块；
街区；
障碍物，阻碍
She
walked
four
blocks
down
High
Street.
There
is
a
block
of
ice.
Language
points
3.
pass
on
传递；
去世；
前进；
对…发表（意见）
He
has
written
a
note
asking
me
to
pass
on
his
thanks.
4.
treat
v.
对待；
治疗；
处理；
款待
Doctors
treated
her
with
aspirin.
If
Mary’s
hand
is
cut
by
a
knife
for
3days,
what
will
she
do?
If
your
leg
gets
hurt
in
P.E,
what
should
you
do?
If
you
have
a
headache,
what
can
you
do?
“Doctor,
can
you
explain
what
antibiotic
is
for
me?”
asks
one
patient.
If
you’re
a
doctor,
Please
treat!
(Pair
Work)
Problems
Pair
work
Which
discovery
do
you
think
is
the
most
important
according
to
the
text?
Group
Work
Example:
A:
I
think
X-rays
are
the
most
important
discovery.
B:
Why?
A:
Because
with
X-rays,
doctors
can
help
fix
broken
bones
more
easily.
…..
Finish
Exercise
book
.
If
you
live
in
school
or
travel
around
for
more
than
10
days,
what
will
you
take
in
your
medicine
bag（急救包）?
Discuss
with
your
partner,
and
write
down
on
the
worksheet.
Homework
