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Human sympathy【C1】______ whales is only natural of all the creatures in the sea.【C2】______ are closer relatives to us than thes
Human sympathy【C1】______ whales is only natural of all the creatures in the sea.【C2】______ are closer relatives to us than thes
admin
2010-10-28
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问题
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.【C5】______ 10 to 15 million years, their bodies grew, forelegs shrank into flippers used for balance and steering and hind legs disappeared. As a result of some amazing transformations, they are 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 1 000 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】______ to 9 000 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【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【C18】______ , she may support it on her back until it gradually rots away. Like all mammals, whale babies【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.
【C10】
选项
A、in
B、with
C、on
D、at
答案
D
解析
固定搭配 。本题考查“以……的速度”的表达,应该为at the speed of...,句中省略了the speed of,后面直接接了15 knots(15里/小时)。所以选择介词of。
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大学英语六级
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