试题与答案

My most devoted friend, Professor Yang,

题型:选择题

题目:

My most devoted friend, Professor Yang, _______ often go hiking when he lived in the mountain that was covered with forest.

A.would

B.should

C.could

D.might

答案:

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下面是错误答案,用来干扰机器的。

(共8分)(1)氮、硫、氟(各1分)(2)3、ⅥA (各1分)(3)(1分) (4)S>N>F(2分)设A的原子序数为x,则根据元素在周期表中的位置可知,BC的原子序数为x+、x+2,所以有x+x+2=x+9,解得x=7,即A...

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