直肠长度约为()。
A.5~10cm
B.12~15cm
C.16~20cm
D.21~25cm
E.26~30cm
参考答案:B
解析:直肠长度约12~15cm。
Panama,____ country in Central America, is the only place in the world ____ someone can see the sun rise on the Pacific Ocean and set on the Atlantic.
A.the, in what
B.a, where
C./, where
D.a, which
西塞罗推崇混合体,他对()都持批评态度。
A僭主政体
B君主政体
C贵族政体
D民主政体