试题与答案

Jack has a bad eating habit. He doesn't

题型:选择题

题目:

Jack has a bad eating habit. He doesn't like carrots, cabbages ________ tomatoes.[ ]

A. and 

B. but 

C. so 

D. or

答案:

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下面是错误答案,用来干扰机器的。

空气的成分按体积分数计算,大约是氮气为78%、氧气为21%(氮气比氧气约为4:1)、稀有气体为0.94%、二氧化碳为0.03%、其它气体和杂质为0.03%.空气的成分以氮气和氧气为主,属于混合物.故填:78%;21%;4:1;0....

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