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题库 / OG2018V-CR-154
A certain species of desert lizard digs tunnels in which to lay its eggs. The eggs must incubate inside the tunnel for several weeks before hatching, and they fail to hatch if they are disturbed at any time during this incubation period. Yet these lizard guard their tunnels for only a few days after laying their eggs.
Which of the following, if true, most helps explain why there is no need for lizards to guard their tunnels for more than a few days?
The eggs are at risk of being disturbed only during the brief egg-laying season when many lizards are digging in a relatively small area.
The length of the incubation period varies somewhat from one tunnel to another.
Each female lizard lays from 15 to 20 eggs, only about 10 of which hatch even if the eggs are not disturbed at any time during the incubation period.
The temperature and humidity within the tunnels will not be suitable for the incubating eggs unless the tunnels are plugged with sand immediately after the eggs are laid.
The only way to disturb the eggs of this lizard species is by opening up one of the tunnels in which they are laid.
因果推理
因为蛋一旦受到干扰就孵化不了，所以蜥蜴要守的久一些 削弱结论
A 只有在短暂的laying季节蛋才可能被干扰，这时一个地方很多有很多蜥蜴。 说明了蜥蜴没必要守很久，季节短而且同伴又多。
B 时间vary无关
C 说明孵化的成功率 无关
D 温度湿度无关
E 唯一一个干扰的方法。 这个选项不能削弱守的久，因为只要蜥蜴走了 ，其他动物就有方法，蛋有被干扰的风险
可以这么说。因为在我看来原文的逻辑是: 蜥蜴蛋孵化需要几周, 期间不能收到打扰, 但蜥蜴妈妈下蛋后只守卫几天。A 的意思是因为在 brief egg-laying season 中如果一小片地方有很多蜥蜴下蛋所以对蜥蜴蛋有威胁。Brief egg-laying season 的意思是短暂的下蛋期, 由此可以推断文中所谓 distrubance 实际上指的是其他蜥蜴下蛋的时候会挖开已经有蛋的 tunnels。那么逻辑就很清楚了: 蜥蜴妈妈只需要守卫到下蛋期结束, 就不会有其他蜥蜴来挖开这个洞穴, 自然就不需要守卫了。
选了D，因为觉得“”唯一能打扰到蛋的方法是把洞挖开“这个操作的难度比较大，所以他们其实没必要去守着；
答案是A，“只有在短暂的下蛋季节时蜥蜴们在相对小的区域内打洞才可能会打扰到蛋的孵化。” 是说这种情况能够的发生的可能性比较小吧，所以没必要守着；
还是不是特别理解。。。老师能不能解释一下？
题干的核心是没必要守太久，题目问题也是解释为什么不用守太久~
这里是说，只有在一个很短的阶段，即所有蜥蜴都去生蛋的时候，蛋才有可能被扰乱，所以蜥蜴妈妈只需要在这段时间把蛋守好久OK了；换言之过了这个时间段之后蜥蜴妈妈就没必要去守蛋了
哦好像有点明白了，她们得先需要去守，才需要考虑守多久的，所以D不对因为基本可以不需要守啦！谢谢咯~~
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