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【单选题】
原子形成分子时，原子轨道之所以要进行杂化，其原因是（）。A.
进行电子重排
B.
增加配对的电子数
C.
增加能力
D.
保持共价键的方向
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反馈参考答案：
举一反三
【单选题】. ____ I am concerned, we should be brave and we will reach the top of the hill at last ____ we try our best to climb the hill.
A.
So long as; as long as
B.
As far as; as longer as
C.
So long as; as far as
D.
As far as; as long as
【单选题】We wondered they reach the top of the mountain.
A.
if ; can
B.
which ; could
C.
that ; will
D.
whether ; could
【单选题】We reach the top of the mountain before it got dark yesterday.
A.
could
B.
were able to
C.
can
D.
are able to
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