四位数一定大于三位数。[ ]
正确
11. Mrs. White found her husband surrounded by letters and papers and _________ very worried
A．looked
B．looks
C．looking
D．to look
预防胎膜早破，禁止性交的时间是（）。
A.妊娠最后3个月
B.妊娠最后2个月
C.妊娠28周后
D.足月妊娠
E.妊娠28周后
