题目内容

bet

A. main
B. better chance of happening
C. to be sure of

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primary

A. to accept something
B. the first thing to do
C. main

more likely

A. better chance of happening
B. to develop, to think of, to create
C. the first thing to do

正面下手发球时，抛球距离最适宜高度是（）。

A. 10CM
B. 20CM
C. 30CM

正面下手发球击球时，击球中上部易导致的后果是（）。

A. 球不过网
B. 球出界
C. 球偏离方向