What is the mystery that researchers find hard to explain? Which of the following is a possible cause of the colony-collapse di

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问题 What is the mystery that researchers find hard to explain?
Which of the following is a possible cause of the colony-collapse disorder?

选项 A、Population explosion.
B、Decreasing number of flowers around.
C、Genetically modified products.
D、Diseases and chemicals.

答案D

解析本题的答案在文章的第四段和第五段。两段的第一句话分别表示疾病和化学物质可能是导致蜜蜂出现群体瘫痪的原因，所以答案为D，其他三个选项在文章中都未提及。

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