葡萄胎刮宫术后，黄素囊肿消退通常需要的时间是（）。

A.2～3周

B.4～6周

C.6个月

D.2～4个月

E.7～8周

用适当的介词填空。

1. This is a shop ____ the hotel.

2. We want to send this letter ____ our teacher.

3. Jenny writes the postcards ____ February fourth.

4. She writes ____ the left ____ the postcard.

5. Danny puts the stamp ____ the top, right corner of the envelope.