Animalshavebeenkilledfortheirfurandfeathers,and   41．(t...

问题详情：

Animals have been killed for their fur and feathers, and    41． (thousand) of kinds of animals have disappeared from the world forever. About 170 kinds in the US alone  42．   (consider) in danger.

Why should people care?   43．   we need animals, and if they are gone, there will never be any more. Every animal has its place in the balance of nature.   44．   (destroy) one kind of animal can create many problems. For example, when farmers killed large numbers of hawks (老鹰), the farmers’ stores of corn and grain were destroyed    45．   rats and mice. With no hawks to keep down their numbers, the rats and mice multiplied (繁殖)    46．   (quick).

Luckily, some people are working    47．  (help) save the animals. Some groups raise money to let people know about    48．  problem. And they try to get the governments to pass laws protecting animals in danger. Quite a few    49．  (country) have passed laws. These laws forbid the killing of any animals on the danger list. Slowly, the number of some animals in danger   50．  (be) growing.

【回答】

41．thousands

42．are considered

43．Because

44．Destroying

45．by

46．quickly

47．to help

48．the

49．countries

50．is

知识点：语法填空

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