2. 自考
  3. The Ostrich The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual d

The Ostrich The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual d

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问题                                                The Ostrich
    The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual deserts. Because of its very long, powerful legs and the floating effect of its extended wings, it is able to run at great speed over considerable distances.
    The female ostrich normally produces about twenty eggs every rainy season. When the female ostrich begins to lay her eggs, however, she does not begin in her own nest. Instead she goes off in search of the nests of neighboring females and lays two or three eggs in each of them. By the time she has laid eight or nine eggs, she returns and lays the rest in her own nest.
    Because of the size of the eggs, the female ostrich cannot lay more than one every two days, so it takes her three weeks to finish laying in her own nest. During that period, she spends a lot of time away from her nest looking for food. And while she is off her nest, other females visit it to lay their eggs amongst hers. By the time she is ready to sit on the eggs to hatch them, there could be up to thirty eggs in her nest, over half of which are not her own.
    The female ostrich can comfortably cover only about twenty eggs when she is sitting on the nest so before settling down she pushes the surplus ten or so eggs out of the nest. The rejected eggs, however, never include any of her own. Each female is remarkably consistent in the size and shape of the
eggs she produces, so it is not difficult for her to distinguish her own from those of strangers.
    Of all the eggs laid by ostriches, only a very small number hatch into young birds. There are times when nests are left unprotected, for there are too few males to sit on all the nests at night. Thus there are ample opportunities for their natural enemies to raid the nests and eat the eggs. In fact, nearly 80% of the nests are destroyed. But even if a particular female’ s nest suffers this fate, there is a good chance that one or two of her eggs will be hatched in the nest of one of her neighbors.
Although the eggs are often raid by their natural enemies, yet one or two of her eggs will be hatched in its neighbor’ s nests.
选项 A、True
B、False
C、Not Given
答案A
解析 题干要求判断虽然鸵鸟的天敌常常洗劫他们产的卵，但是一到两个卵是否会在他们邻居的巢穴中得到孵化。最后一段讲到虽然有些天敌“raid the nests and eat the eggs”，但是“one or two of her eggs will be hatched in the nest of one of her neighbors”，所以题干表述是正确的。
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