正确答案: B

柳属的柔荑花序是原始性状，虫媒是次生性的

题目：柳属植物具柔荑花序，却为虫媒传粉，这是因为( )。

解析：B

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举一反三的答案和解析：

[单选题]Which of the following is true?

The underground water in Saudi Arabia might run out in 50 years.

[单选题]Over the past 20 years, the Internet helped change our world in _____way or another for the better.

one

[单选题]52

same