正确答案: A

twice

题目：medicine

解析：A

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举一反三的答案和解析：

[单选题]泡桐花中雄蕊二强，生于花冠简上。( )

正确

[单选题]CPlants can’t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily change from a liquid to a gas. A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.

producing some chemicals D． sending out electronic signals

[单选题]锦葵科植物中有各种棉、洋麻等纤维植物，其纤维是( )。

B和C