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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.
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。
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