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When baby turtles first come out of eggs...

    When baby turtles first come out of eggs, they head to the sea by nature. The beach surface goes down, which is one directional clue they follow. Another is light: The horizon (地平线) over the sea is brighter than the horizon over land.

But lights from towns and beach developments can confuse the baby turtles. The sky shining above a city can mislead them to wander. And particularly bright lights can draw them away from the sea.

You’d think the extra time crawling (爬行) might wear out baby turtles, which need energy  once they get in the water to swim for about a day to get to their destination in the sea. In a normal trip from nests to waves, the babies build up chemicals that show they have been pushing themselves.

Some researchers took the baby turtles to a lab, where they ran on a treadmill and swam in a tank while their blood and breathing were monitored. The finding is surprising: even after hours of crawling, the turtles were fine by all measures and swam as well as turtles that didn't have an extra crawling period.

The reason is that they often stop while crawling if they are doing U for a long time, unlike the disturbed trip they make when heading straight to the water. So misled turtles are not worn out.

But the misleading lights are still a problem for the babies. The longer they spend on the beach wandering, the more they are exposed to natural enemies. They can also end up losing their lives in the heat of the sun.

1.What attracts the baby turtles away from the sea?

A.Bright lights. B.Vast beaches.

C.Buildings in cities. D.Noises from towns.

2.What does the underlined word “they” refer to in paragraph 3?

A.Chemicals. B.Nests.

C.Waves. D.Baby turtles.

3.Why don’t the baby turtles feel exhausted after long crawling?

A.They travel by night. B.Their trip is undisturbed.

C.They take frequent breaks. D.They are refreshed by city lights.

4.What may happen to the baby turtles exposed to misleading lights?

A.They are in great danger.

B.They avoid their natural enemies.

C.They will wander on the beach for a while.

D.They are more likely to find the destination.

 

1.A 2.D 3.C 4.A 【解析】 本文是一篇说明文。文章讲述了小乌龟出生后自然就会奔向海洋。海滩表面和光线是它们前进的指示,在进入海洋的过程中它们有时会处于危险之中。 1.细节理解题。根据第二段中的“The sky shining above a city can mislead them to wander. And particularly bright lights can draw them away from the sea.”可知,城市上空闪耀的天空可能误导它们四处去游荡。特别明亮的灯光会吸引它们离开大海。即明亮的灯光吸引小海龟远离大海。故选A。 2.词义猜测题。根据第三段中的“You’d think the extra time crawling (爬行) might wear out baby turtles, which need energy once they get in the water to swim for about a day to get to their destination in the sea.”可知,额外的爬行可能会使小乌龟疲劳,它们需要能量使自己进入水中游大约一天的时间到达目的地。因此划线词they指的是小乌龟。故选D。 3.推理判断题。根据倒数第二段中的“The reason is that they often stop while crawling if they are doing U for a long time. So misled turtles are not worn out.”可知,如果小乌龟长时间地以U形路线移动,它们经常会在爬行时停下来。因此它们不会感到疲惫。即长时间爬行后小海龟不感到筋疲力尽的原因在于它们经常停下来得到了休息。故选C。 4.推理判断题。根据最后一段中的“But the misleading lights are still a problem for the babies. The longer they spend on the beach wandering, the more they are exposed to natural enemies. They can also end up losing their lives in the heat of the sun.”可知,对于小乌龟来说,误导性的灯光仍然是一个问题。它们在海滩上的时间越长就越容易受到天敌的伤害。它们还可能最终在阳光下失去生命。因此暴露于误导性光照下的小乌龟会处于极大的危险中。故选A。
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