2. 外语
  3. What is the mystery that researchers find hard to explain? The word "diversity" in the last paragraph means

What is the mystery that researchers find hard to explain? The word "diversity" in the last paragraph means

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问题 What is the mystery that researchers find hard to explain?
The word "diversity" in the last paragraph means
选项 A、variety.
B、makeup.
C、disorder.
D、distinction.
答案A
解析 最后一段第二、三句话表明，任何蜜蜂群体都存在多种不同基因，一个群体中存在的基因种类越多，这个群体基因多样性的程度就越高。结合第三句话的前后部分，可以断定 diversity的意思是A。
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