3. Can we change the topic? Talking about it _________ my food.

put me off    puts off     puts off me      puts me off

4. One day I’d love to travel to _________! I’d even buy a one-way ticket to Mars.

space     the space     the Space     spaces

5. Earth orbits _________.

the Sun     the Moon     the planets     the solar system

答案 1. 阅读课文并回答问题。

1. When did dinosaurs become extinct? 

    Many scientists believe that dinosaurs became extinct 66 million years ago.

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

    A huge crater was discovered which struck Earth at the same time as when the dinosaurs became extinct.

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

    Scientists aren’t sure why this happened. It may have been caused by an object hitting the Earth, for example a comet or icy         rock sent our way by a dim star or ninth planet.

4. Which verb means: ‘to throw’?

    To hurl.

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

    True. All stars eventually burn through their energy supplies. 

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 a rough ride. I’m glad to see the end of it.

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