Scientists are convinced______ the positive effect of laughter______ physical and mental health.
A．of ; atB．by ; inC．of ; onD．on ; at
C
考察介詞。Be convinced of 為固定詞組，意為對(duì)……信服  effect on sth 意為對(duì)……的影響 為固定短語(yǔ) ，所以選擇C
句意為，科學(xué)家們對(duì)笑聲對(duì)身心健康產(chǎn)生的影響深信不疑。
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

In many countries in the world, breakfast is a snack _______ a meal, but the traditional         English breakfast is a full meal.
A．other thanB．more thanC．rather thanD．less than

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

In summer, I enjoy walking along a small river        green grass and red flowers on both sides.
A．ofB．inC．withD．for

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

He died in 1870 and his tomb reads, ‘________ his death, one of the England’s greatest writers _________ to the world.’
A．At; is lost inB．By; is lost to
C．For; is a loss toD．As; gets lost to

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

Customs vary greatly _______ country to country.
A．from B．a(chǎn)t C．for D．with

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

I soon found that the work I was doing had already been done by someone else. _______, I was wasting my time.
A．In other wordsB．In a wordC．As a resultD．In addition

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

With its economy in great stress, the Chinese government is now ________ to get a way out and looking forward to a new stage in 2012.
A．a(chǎn)wkwardB．generousC．disturbingD．desperate

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

Washington, a state in the United States, was named _______ one of the greatest American presidents.
A．in honor ofB．in spite ofC．in favor ofD．in face of

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

Nowadays，skiing，     being a sport, has become a big industry and a notable feature of leisure culture．
A．except forB．a(chǎn)part fromC．far from D．due to

查看答案和解析>>

同步練習(xí)冊(cè)答案