演讲可以不在特定的时空环境中进行。
参考答案：错
There _____ many students in the library after school every day. [ ]
A. has
B. have
C. is
D. are
输卵管通液术适用于：
A．输卵管炎
B．输卵管积脓
C．继发不孕
D．评价输卵管绝育术的效果
E．输卵管结核
