Unit 3 Conservation Lesson 1 The Sixth Extinction 课件(共11张PPT)-北师大版（2019）选择性必修第一册

(共11张PPT)
Unit3 Lesson 1
词汇课
Let’s read together！
die out 消失,灭绝
species ['spi: i:z] n.物种,种
wipe [waip] vt.擦,拭
wipe out 彻底毁灭
unusual [ n'ju: u l] adj.异常的,不平常的
mass [m s] adj.大量的
varied ['ve rid] adj.各种各样的,形形色色的
*asteroid [' st r id] n. 小行星
decrease [di'kri:s] n.减少,减少的量 vi.& vt.减少
blame [bleim] vt.责怪,指责
be to blame 把……归咎于
affect [ 'fekt] vt.影响
be at risk 处境危险,受到威胁
endangered [in'deind d] adj.濒危的
solar ['s ul ] adj.太阳光(能)的
hatch [h t ] vi.& vt.(使)孵化
restore [ri'str :] vt. (使)恢复
die out
消失；绝迹，灭绝
die away 逐渐减弱；逐渐消失
die of 死于（疾病、衰老）
die from 死于
die off 先后死去；相继死去
→ dead adj. 死的；失去生命的
e.g. The wild population of koalas is in danger of ____________ (用 die 相关的短语填空).
dying out
unusual
adj. 异常的；不平常的；独特的，与众不同的
单句写作：对他来说，步行上班不太寻常。
e.g. This time, we stayed together, in case anything else __________ (usual) happened.
It is _________________ to walk to work.
/ n ju u l/
→ usual adj. 平常的；通常的；惯常的　
→ usually adv. 通常，平常
unusual for him
unusual
varied
adj.各种各样的，形形色色的；多变的
He decided to leave school for _________ reasons.
e.g. The reasons for extinctions are varied.
→ vary v．变化，不同，相异
→ various adj.各种各样的
→ variety n．种类；多样化
various
/ ve rid/
vary from... to... 从……到……不等/变化
decrease
/d kri s/
n．减少；减少的量　
vi & vt.减少
decrease by/to... 减少了/到
on the decrease 在减少
The number of visitors was ________________.
e.g. The reasons for extinctions include the decrease of the oxygen
content of the sea and global warming .
on the decrease
（反）→ increase v./n. 增长；增多；增加
blame
/ble m/
vt. 责怪，指责；把……归咎于　
n． 责备；过失
完成句子：We shouldn't blame ourselves _______ what happened.
for
be to blame (for sth.) 应(为……)承担责任
blame sb. for... 因……指责某人
This time, human activity will be to blame.
affect
/ fekt/
vt.影响；(感情上)深深打动; (疾病)侵袭，
→ affection n．喜爱，钟爱
→ effect n．影响，结果，效应
This disease ________ millions of people in the world every year.
e.g. It is clear that human activity has negatively affected all other species on Earth.
affects
endangered
/ n de nd d/
adj.濒危的
Development of the area would ____________ (danger) wildlife.
e.g. For example, we need to take steps to save endangered species.
endanger
→ endanger vt.危害；危及；使处于险境
extinct
/ k st kt/
adj.灭绝的，绝种的；消亡的；不再活跃的；死的
→extinction n．灭绝；消亡
Many species of plants and animals are in danger of ___________.
e.g. How long do we have before rhinos become extinct？
be close to extinction 濒临灭绝
extinction
Let’s check your progress！
1. Many species are in danger of dying ________ due to habitat loss.
2. The manager was ________(blame) for the failure of the project.
3. We experienced some ________ (usual) warm weather for January.
4. The government is taking measures ___________ (decrease) pollution.
5. The store offers a wide and ________ (vary) selection of fruits.
6. Everyone admits that smoking has a bad ________ (affect) on health.
7. The _________ (extinct) of the dodo bird is a lesson for humans.
8. We must protect ___________ (endanger) animals from illegal hunting.
out
to blame
unusual
to decrease
varied
effect
extinction
endangered