1.The population of this city, forty percent of which ______15% in the last three years.
A. are Germans; has risen by
B. are Germen; has fallen by
C. is Germans; have increased to
D. are Germans; have been reduced by
分析:本题旨在考查本单元的词汇population的用法以及主谓一致。population强调人口是多少时,若作主语,谓语动词用单数形式。population强调人口的身份或特征,若后面作表语的名词是复数时,谓语动词则要用复数形式。据题意,第一空中Germans 用复数,则谓语动词用复数,B、C两项可排除,而the population of this city强调人口,谓语动词需用单数,故本题最佳答案为A。
2.You will be late ______ you leave immediately.
A. unless B. until C. if D. or
解析:本题考查连词的用法。unless除非......,与本题中除非立刻就去,不然你会迟到的意义相符。而until直到......才......常表示延续动作或状态直到某时结束。or表示或者否则,如选D,原题应为leave immediately, or you will be late,这属于另一种句型。故选A。
3.______ him and then try to copy what he does.
A. Mind B. Glance at C. Stare at D. Watch
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