单选题：Scientists are convinced ______ the positive effect of laugh..

题目内容：

Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.A．of；at　　　B．by；inC．of；on　　　D．on；at
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In copying this paper, be careful not to leave _______ any ..

In copying this paper, be careful not to leave _______ any words.A．asideB．forC．outD．off

分类：介词和介词短语  题型：单选题
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Jack looked very calm ________ the quarrel with his desk mat..

Jack looked very calm ________ the quarrel with his desk mate.A．due toB．because ofC．as a result ofD．in spite of

分类：介词和介词短语  题型：单选题
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It is said ______ vegetables and fruits are good to our heal..

It is said ______ vegetables and fruits are good to our health, apples and pears _________.A．that, includingB．what, includingC．that, includedD．what, included

分类：介词和介词短语  题型：单选题
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What’s your attitude ______ the disabled people?A．towards..

What’s your attitude ______ the disabled people?A．towardsB．ofC．overD．on

分类：介词和介词短语  题型：单选题
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The TV play series The Revolution of 1911, broadcast on CCTV..

The TV play series The Revolution of 1911, broadcast on CCTV1 lately, is ________ the 100th anniversary of The Revolution of 1911.A．in favor ofB．in honor ofC．in place ofD．in search of

分类：介词和介词短语  题型：单选题
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