要详细解析的....
Childhood is a wonderful time , with many joys and few responsibilities,____ life can be hard for African children.
A.because B.while C.although D.if
【正解：C】（although不是一般放句首的么？为什么不能选B呢？）
Out ____ , and away ____.
A.the man went;was heB.went the man;he wasC.went he;he was D.the man went;he was
【正解：B】（C为什么不能选..）
For many seniors in some universities,the final year can be an unpleasant experience,____ that ends the campus romance.
A.which B.the one C.what D.one
【正解：D】
Using renewable energy sources is simple idea,but ____ we find it hard to put into practice.
A.one B.what C.which D.that
【正解：A】（诶，头疼，同样是one的用法的问题..）
--Do you mind if I record your lecture?
-- _____.
A.Never mind B.No way C.Not at all D.No.You'd better not.
【正解：C】（为什么A不行？）
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