我国卫生部规定,一名供精者的精子最多只能提供给()。
A.8名妇女受孕
B.6名妇女受孕
C.15名妇女受孕
D.5名妇女受孕
E.10名妇女受孕
参考答案:D
人的行为可以控制,但人的情绪是不可调控的。[ ]
Not until all the fish died in the river, _______ how serious the pollution is. [ ]
A. did the villagers realize
B. the villagers realize
C. the villagers did realize
D. didn't the villagers realize