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问题 选择题
已知A、B为球面上的两点，O为球心，且AB=3，∠AOB=120°，则球的体积为（　　）
A．
9π
2
B．4
3
C．36πD．32
3
π
答案

△AOB为等腰三角形，∠AOB=120°，AB=3，通过解三角形解出OA和OB，即OA=OB=R=

3
，从而求出球的体积4
3
π，

故选B．

选择题

What shocked the police and the people around most was that the kidnapper suddenly ______his pocket and took out a gun in a desperate attempt to escape with the kidnapped child.

A．dived into

B．slipped into

C．slid into

D．fit into
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单项选择题 A1/A2型题

“不可曲止也”中的“曲”意思是（）

A.弯曲

B.插曲

C.详尽

D.迂回

E.隐蔽
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