Many people like the gigantic whales. Human sympathy 【C1】______ whales is

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问题    Many people like the gigantic whales. Human sympathy 【C1】______  whales is only natural of all the creatures in the sea. 【C2】______  are closer relatives to us than these warm-blooded mammals. And how they got into the sea is one of the most fascinating stories of 【C3】______  . Most authorities believe that 60 million years ago ancestors of modern whales were four-legged, wolf-size animals living on the sea shores, 【C4】______  an abundance of fish and shrimp tempted them to try wading. Over 10 to 15 million years, their bodies grew, forelegs shrank into flippers used for 【C5】______  and steering and hind legs disappeared. As a result of some amazing transformations, they arc now helpless on land. If stranded on a beach, they can barely breathe.
With abundant 【C6】______  of food, whales grew into the largest creatures that lived, 【C7】______ larger than dinosaurs. A blue whale can grow to 100 feet. Its tongue is ten feet thick and heavier than an elephant. Some arteries are big enough for a child to swim 【C8】______  . The half-ton heart has walls two feet thick and pumps eight tons of blood. 【C9】______  its size comes awesome strength. A blue whale swimming 【C10】______  15 knots generates 1000 horsepower. 【C11】______  their size, these giants move at a good speed. An 18-ton whale can even 【C12】______  12 m. p. h., over short distances. A whale can 【C13】______  up to 9000 pounds of food a day. The world’s biggest creature 【C14】______  itself almost entirely on shrimp-like krill, smaller than a person’s thumb.
Maternal instincts are also highly 【C15】______  . Because a calf is born underwater, the mother must get it to the surface before it 【C16】______  . Often another whale will help. The mother pushes it gently 【C17】______  the baby is confident with its swimming usually after about 30 minutes. If the calf is born 【C18】______  , she may support it on her back until it gradually rots away. Like all mammals, whale babies feed 【C19】______  mother’s milk. And the milk is more than 30-percent fat, over 10-percent protein, and the babies grow extremely fast. A blue whale calf lengthens 【C20】______  two inches a day and gains an average seven pounds per hour.  [br] 【C5】

选项 A、breathing
B、balance
C、rest
D、eating

答案 B

解析名词辨析题。本句介绍鲸鱼的身体进化的过程。此处主要描述鲸的前腿蜕变成前鳍过程。根据常识，鲸的前鳍是用来平衡身体的，故B)balance符合句意。A)breathing“呼吸”是鳃的功能；“休息”和 D)“吃东西”均不符合常识，均排除。

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Many people like the gigantic whales. Human sympathy 【C1】______ whales is

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