2. 专升本
  3. Rats! Through all of human history, they have been a【C1】______and a plague to people. They eat or【C2】______crops of grain and ri

Rats! Through all of human history, they have been a【C1】______and a plague to people. They eat or【C2】______crops of grain and ri

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问题     Rats! Through all of human history, they have been a【C1】______and a plague to people. They eat or【C2】______crops of grain and rice before they can be harvested, or while they are【C3】______storage. In India,【C4】______millions of people go【C5】______, there are ten times as【C6】______rats as people. Rats eat【C7】______of the available food. Rats will also【C8】______birds and animals, from frogs and chicks to geese and young calves. They have even destroyed dams and buildings【C9】______digging through or under them, and have started fires by chewing on electrical wiring.
    The more terrible destruction【C10】______by rats, however, has come【C11】______the diseases they【C12】______. In the fourteenth century, rats caused the death of one third of the world’s population by【C13】______the dreadful Black Plague than Roman Europe.
    Ironically, it is in fighting diseases【C14】______rats have been most useful【C15】______humanity. Thousands of specially【C16】______rats are used in research laboratories every year to【C17】______medicines【C18】______can possibly be used to【C19】______and improve human life. Some laboratory rats are even used to test new methods of【C20】______their cousins, the wild rats.
【C14】
选项 A、when
B、where
C、that
D、which
答案C
解析
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