正确答案: D

是对环境条件的适应

题目：自花传粉现象在自然界得以保存，是因为它( )。

解析：D

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举一反三的答案和解析：

[单选题]What does the man mean?

The watch is no longer worth repairing.

[单选题]

earn

[单选题]47___

confidently

[单选题]Food poisoning can be caused by all the following EXCEPT________.

low temperatures

解析：

由第五段Food should be kept in a refrigerator to stop microorganisms from gnawing.可知low temperatures不能导致Food poisoning

[单选题]This text is most probably taken from_

a newspaper report