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  3. There are exceptions to the rule of male insects being smaller than the females, and some of these exceptions are intelligible.

There are exceptions to the rule of male insects being smaller than the females, and some of these exceptions are intelligible.

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问题     There are exceptions to the rule of male insects being smaller than the females, and some of these exceptions are intelligible. Size and strength would be an advantage to the males which fight for the possession of the females, and in these cases, as with the stag-beetle (Lucanus), the males are larger than the females. There are, however, other beetles which are not known to fight together, of which the males exceed the females in size, and the meaning of this fact is not known, but in some of these cases, as with the huge Dynastes and Megasoma, we can at least see that there would be no necessity for the males to be smaller than the females, in order to be matured before them, for these beetles are not short-lived, and there would be ample time for the pairing of the sexes.  
Where male beetles are smaller than female beetles, it is because ______.
选项 A、they have to fight for their mates
B、they are more intelligent
C、they are ephemeral creatures
D、there is ample time for mating
答案C
解析 如果雄性甲壳虫比雌性甲壳虫小，那是因为它们是短命的动物。在本文末尾几句，尽管作者在讨论大的雄性甲壳虫，但是我们可以了解到为什么另外一些雄性甲壳虫要小一些，是因为它们成熟得早一些，还因为它们短命。
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