题目内容

15．There ________ a set of keys on the desk．Some boxes ________ on the desk，too．（　　）
A．is； areB．are； areC．is； isD．are； is

分析 桌子上有一串钥匙，一些盒子也在桌子上．

解答 答案：A．考查there be句型．句意"桌子上有一串钥匙，一些盒子也在桌子上．"．第一个空，there be句型，"有"的意思，be动词单复数与临近主语单复数一致．由a set of keys一串钥匙，可知是单数，用be动词单数is．B，D不正确．第二个空，主语boxes复数，因此用be动词复数are，C不正确．答案是A．

点评 考查there be句型，there be 结构中的谓语动词be在人称和数上应与临近主语一致．要结合语境选择合适用法．注意时态，人称等变化，及与have的区别．

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C．you should save the environment
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D．what healthy diet is
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B．Girls'age for starting puberty is usually earlier than that for boys'．
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B．impossible       
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D．unrealistic
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B．Threehours．
C．Fourhours．
D．Five hours．
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B．To connect the counterwith Eastem Europe．
C．To connect the counter with SoutheastAftica．
D．A and B．
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B.1，069 ki1ometers； 3hours．
C.346 ki1ometers； 4 hour．
D.1，069 ki1ometers； 4hours．
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B．The trains would be almost as fast as some airplanes-346kms an hour
C．People wi11trade with CentralAsian and Eastem European countries withhigh-speedtrains
D．Above a11．

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