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答题结果:0/6
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Question 5 of 6
The professor mentions theories about why leaves turn red that involve predatory insects and fungi. What is her opinion about those theories?

A.

They are based on careful research

B.

They do not completely explain the phenomenon

C.

They have not received enough attention

D.

They have been proved to be incorrect

我的答案:

正确答案:B

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