Unit 3 Lesson1 Reading 学案--高中英语北师大版（2019）北师大选择性必修第一册（有

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北师大选择性必修第一册UNIT 3课文阅读理解lesson1
Ⅰ.Read the passage quickly and fill in the following blanks with suitable words.


Ⅱ.What’s the main idea of the passage?
The main idea of the passage is the ______ of species and the ______ and how to______the sixth extinction.
答案 extinctions ;reasons; avoid
Choose the best answer.
1．All the following reasons caused the five extinctions except .
A．volcanic eruptions          B．changes in sea levels
C．global warming          D．human activities
2．What can we know from Paragraph 2?
A．Human activity has done harm to nature.
B．It is unusual for species to die out naturally.
C．Species die out quickly due to natural causes.
D．There are few reasons why so many species are dying out.
3．How can we avoid a sixth extinction?
A．By changing the way we live.
B．By changing how we work and travel.
C．By improving our farming methods.
D．All of the above.
答案　DAD
Ⅰ.After reading the passage，please fill in the following blanks.
Extinctions，where entire species are wiped out，are not unusual in our Earth’s history.In fact，over 90 percent of all species 1._____ ever lived are now extinct.In the last 500 million years，there 2._______(be) five times when life on Earth has almost ended,3._______(include) the third mass extinction，known as the “Great Dying” and the fifth event.The 4._____(reason) for extinctions are 5._______(vary)．Many scientists say we are now entering the Earth’s sixth mass extinction.This time，human activity will be 6.______(blame)．
A 2015 study by scientists found that human activity is causing species to die out 1,000 times 7.______(fast) than normal.8._____ is clear that human activity has negatively affected all other species on Earth，including animals and plants.
If a sixth mass extinction 9.______(occur)，scientists who have studied the issue believe that up to three quarters of all species on Earth could die out and we would also be 10.___ risk of dying out.In short，if we want to survive，we need to stop destroying the planet that we live on and start to protect it.
1.that  2have been 3 including 4 reasons 5 varied 6 to blame7  faster  8It 9 occurs 10 at
Ⅱ.Discuss with your partner and then answer the following questions.
1．How much do you know about extinction？Do you know which animals are dying out now?

2．As a student，what can we do to protect animals and plants?

1．Extinctions，where entire species are wiped out，are not unusual in our Earth’s history.
______________________________________________________________
2．These include the third mass extinction，known as the “Great Dying”，which killed 90% to 96% of all species.
[______________________________________________________________
3．Although it is not unusual for species to die out naturally，the rate at which this is now happening is cause for concern.
[______________________________________________________________
1 句式分析]　本句是一个主从复合句。Extinctions are not unusual in our Earth’s history是主句；where entire species are wiped out是where引导的定语从句，where在句中作状语。
[自主翻译]　物种灭绝，即某个物种的完全消失，在地球的历史上并不罕见。
2 句式分析]　本句为复合句。These include the third mass extinction是主句；known as the “Great Dying”是过去分词短语作定语；which killed 90% to 96% of all species是which引导的定语从句，which在句中作主语。
[自主翻译]　这其中包括称为“大灭绝”的第三次灭绝，那期间90%至96%的物种灭亡了。
3 [句式分析]　本句是复合句。 the rate is cause for concern是主句；Although it is not unusual for species to die out naturally是although引导的让步状语从句；at which this is now happening是“介词＋关系代词”引导的定语从句。
[自主翻译]　虽然物种的自然灭绝并不罕见，但现在灭绝的速度让人担忧。