在行IVF-ET过程中，一般注射hCG约多长时间取卵（）

A.24小时

B.48小时

C.12小时

D.36小时

E.72小时

根据句意和汉语提示，在空格中填入正确的单词（每空填一词）。

小题1:North points up on a _______ (地图).

小题2:There is a tall tree________ (在。。。。。。的后面) the teaching building.

小题3:_________(没有什么) is difficult to the men who will try.

小题4:_________ (十月) 1st is the National day of the PRC.

小题5:He always __________(抄写) new words on pieces of paper and reads them aloud.

小题6:It's _________ (礼貌 ) to be quiet in the library.

小题7:No one can__________ (成功) without any hard work.