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. I discovered the other day that I have a __________ relative living in Greenland. She's actually my first cousin.

direct       close       good       near

2. Darwin explained his famous __________ theory of natural selection in 1859 in his book 'On the Origin of Species'.

revolutionary       evolutionary       evolution       extraordinary

3. If babies wear too many clothes in hot weather, they are at __________ of overheating.

risk       danger       likely       possibility

4. Daniel __________ hard work. He's happiest when he's got lots of problems to solve at the office. 

thrives at       thrives on       thrives with       thrive on

5. Our human ancestors lost hair because this allowed them to sweat with the greatest __________.

effort       deficiency       efficiency       sufficiency

答案 1.  阅读课文并回答问题。

1. True or false? All primates are covered in fur.

False. Humans only have a little hair on their bodies compared to other primates.

2. Who was Charles Darwin?

He was a famous evolutionist.

3. Why was moving to the savannah a problem for our early ancestors?

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