半膜肌和半腱肌可（）
A.伸膝关节，膝关节旋内
B.屈膝关节，膝关节旋外
C.膝关节旋内
D.膝关节旋外
E.限制屈膝关节
参考答案：C
I have two pairs of shorts. _____ are nice.[ ]
A. Shorts
B. It
C. These
D. They
If ______ in wet sand, the vegetables can ______ fresh for a long time.
A．being buried; remain
B．buried; remain
C．buried; be remained
D．burying; remain
