a rough ride 一段艰难的历程

mass extinction 物种大灭绝

to kill off 杀死、消灭

crater （火山口式的）圆坑

geological 地质的

to wipe out 彻底灭绝

dense 密度大的

to orbit 沿轨道围绕（行星或恒星）运行

Solar System 太阳系

comet 彗星

to hurtle 猛冲

to put someone off (something) 丧失对某事的兴致

macabre 恐怖的，令人害怕的

interstellar 星际的

to snuff it （俗语）死亡，断气

测验与练习 1. 阅读课文并回答问题。

1. When did dinosaurs become extinct?  

2. What evidence is there that a meteorite wiped out the dinosaurs?

3. Why was 96% of life destroyed at the end of the Permian period? 

4. Which verb means: ‘to throw’?    

5. True or false: All stars eventually run out of energy.

2. 请你在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处。

1. Last year was __________. I’m glad to see the end of it.

rough riding     a rough rider     a rough ride     rough ride

2. Washing clothes in boiling water __________ bacteria.

makes     extinct     kills off     snuffs     wipes off

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