2022年4月6日托福阅读真题+题目+答案：Tern Hunting of Fish

2022年4月6日托福阅读真题+题目+答案：Tern Hunting of Fish

Terns are a group of bird species that hunt fish close to the water surface.Fish have adaptations to avoid being eaten,including cryptic coloration (most fish are dark along the back,even if they are silvery on the sides),habitually swimming at depths below those at which they are in danger from above,and taking evasive action if they see a bird diving toward them.Terns have their own cryptic coloration,most having white or light grey underparts so that they are difficult to see from below the surface,and they dive vertically toward the fish at the highest possible speeds.

1.Which of the following is true about the cryptic coloration of fish described in paragraph 1

O It is most often present in fish that are unable to swim at great depths.

O It is usually dark on parts of their bodies visible to terns.

O It is absent in fish that can move quickly to avoid diving terns.

O It often matches the coloration of the terns that hunt for them.

⬛ Terns also have to learn to adjust for parallax:sunlight changes direction at the air-water interface,which makes fish appear always to be at shallower depths than they really are. ⬛ This is an especially difficult problem when the water surface is wavy,which makes the image of the fish move around horizontally as well as vertically-as one can see by looking down from a bridge or dock into rippled water. ⬛ Terns must learn by trial and error to compensate for parallax and dive accurately toward a target that appears to be moving unpredictably. ⬛ It has been shown that terns' success in catching fish declines with increasing wind speed,presumably because increasing waviness of the surface makes the fish increasingly hard to locate.At the other extreme,terns' fishing success declines again at very low wind speeds,either because the terns have more difficulty hovering to locate the fish in still air,or because the fish can see the terns more easily when the surface is smooth.Except in the most favorable circumstances,terns' fishing success is usually quite low-typically only one fish caught for every three or four dives,with many attempts broken off even before the tern hits the water.

2.The word “presumably” in the passage is closest in meaning to

O especially

O probably

O obviously

O Sometimes

3.Paragraph 2 indicates that parallax is a problem for terns because

O it can lead them to not dive deep enough to catch their prey

O it can prevent sunlight from shining on their target fish

O it can cause their target fish to move away quickly during their dive

O it can make them dive faster than necessary to reach their target fish

4.According to paragraph 2,all of the following may lower the rate of successful dives by terns EXCEPT

O heavy wind

O the presence of bridges or docks

。。。。。。余下托福阅读真题题目及答案省略！

2022年4月6日托福阅读真题+题目+答案：Tern Hunting of Fish，10元有偿下载本篇完整版！