What does the passage mainly discuss? [br] The purpose of the second mention o

游客2024-01-05  12

问题  What does the passage mainly discuss? [br]  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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