Do you usually ____________ to school? [ ]
A. ride
B. rides
答案:A
某孕妇,自然流产2次,查原因怀疑为宫颈内口松弛所致。目前孕9周,若进行子宫内口缝扎术最好在妊娠的()
A.25~28周
B.21~24周
C.17~20周
D.14~16周
E.12~13周