题目内容

Sorry, you can’t take the typewriter away, I ____it.

A. use
B. used
C. have used
D. am using

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President Obam_____China in May.

A. visits
B. is to visit
C. is visiting
D. visited

It ____true that sun rises from the east.

A. be
B. been
C. is
D. was

A属地管理
B分级负责
C及时准确
D简单方便

骨的构造包括（)。

A. 骨质
B. 骨质和骨膜
C. 骨质、骨膜和骨髓
D. 骨质和骨髓
E. 骨膜和骨髓