单项选择题

Passage Two．听材料，回答下列各题：
A.Studying yoga
B.Adult education．
C.Playing tennis．
D.The search for physical fitness．

A.Studying
B.Adult
C.
C.Playing
D.
D.The
E.

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单项选择题

A.Because they want to retum to the job market．
B.Because they want to leam something new．
C.Because they want to make up for the education they missed．
D.Because they want to prove themselves to be useful．

A.Because
B.
B.Because
C.
C.Because
D.
D.Because
E.

单项选择题

下列各组轨道重叠成键，重叠效果最好的是( )。
A．s-s B．p-p C．sp-sp D．sp²-sp² E：sp³-sp³

A.s-s
B.p-p
C.sp-sp
D.sp²-sp²