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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
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