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  3. What is the mystery that researchers find hard to explain? Researchers are seriously concerned with the phenomenon of colony-co

What is the mystery that researchers find hard to explain? Researchers are seriously concerned with the phenomenon of colony-co

admin2009-05-21  33
问题 What is the mystery that researchers find hard to explain?
Researchers are seriously concerned with the phenomenon of colony-collapse disorder because
选项 A、honeybees help produce one-third of the foods we eat.
B、parasites on bees may spread everywhere.
C、honeybees cannot find enough food elsewhere.
D、honeybees feed on flowers.
答案A
解析 文章的第二段的第一句话给出了答案。研究者之所以密切关注这一现象是因为我们三分之一的食物的生产离不开蜜蜂传播花粉。
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