阅读下面短文在空格处填入一个适当的词或使用括号中词语的正确形式填空。

　　“You’ll think twice about plucking your eyebrows (拔眉毛) 16. ______ you find their important role,” says Greg Foot. They are one of 17. _______ most expressive(有表现力的) parts of our bodies. 18. ______ your eyebrows, you can tell your feelings to other people. 19._______ is that their only purpose (目的)? Over several thousand 20. _______ (year), we have lost lots of body hair, so it’s strange that hair still 21. _______ (remain) on our brows. Some scientists say that eyebrows mainly work as 22. ______ special form of protection for the eyes. In fact, their job is so 23._______ (importance) that some researchers are sure that if we didn’t have 24. ______ (they), we’d have evolved (进化) some other facial features to 25. ________ (do) the same task.

　　参考答案：

　　16. when 17. the 18. With 19. But 20. Years 21. remains 22. a 23. important 24. them 25. Do

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