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  3. What does the passage mainly discuss? The purpose of the second mention of "hormones" in line 4 is to point out

What does the passage mainly discuss? The purpose of the second mention of "hormones" in line 4 is to point out

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问题  What does the passage mainly discuss?
  The purpose of the second mention of "hormones" in line 4 is to point out
选项 A、chemical signals that are common among insects
B、specific responses of various species to chemical signals
C、similarities between two chemical substances
D、how insects produce different chemical substances
答案C
解析
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