题目内容
9．The population of our city has increased from 28million to 31million．分析 我们这个城市的人口已经从两千八百万增加到了三千一百万．
解答 答案：increased．
根据主语是"The population of our city"我们这个城市的人口，又根据"from 28million to 31million"从两千八百万到了三千一百万．结合给出的首字母提示i，因此可知这句话的意思是"我们这个城市的人口已经从两千八百万增加到了三千一百万．"空格前面的词是has，所以要用increas的过去分词increased来填空，构成现在完成时，综上所述，故填increased．
点评 首先要掌握句子的意思，然后结合具体的题目，就可以确定正确答案．
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"Mother!"he cried，"A mad dog has（41）D my friend Henry，and now they are burning him with red-hot irons（烙铁）．It's terrible!"
"Rabies（狂犬病），Louis．Burning the bites is the only（42）Bof stopping Henry from catching the disease．''
Henry did get rabies and died，in great（43）A，some days later．Louis Pasteur never（44）A．"One day，"he thought，"I must do something to help people like Henry．"
Sixteen years later Pasteur became a Doctor of （45）D．And he began his work in this special field．Pasteur achieved great success in his life．（46）Cthe years of research he lost the use of his left arm and leg，yet he never lost heart．He worked on and on，as hard as ever，（47）D he had a strong will to find a way for curing rabies．
After many dangerous experiments on mad dogs，he（48）Bfound the answer．Just then a boy who had been badly bitten by a mad dog arrived at his lab．A few days later Pasteur's treatment，the boy got （49）C．He did not catch rabies．
The discovery gave new hope to people in many countries．People sent money to help（50）A the Pasteur Institute in Paris．Today it is one of the world's most famous centers for the research．
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