全国性抗日战争开始于[ ]
A.“八一三”事变
B.“七七”事变
C.“九一八”事变
D.“一·二八”事变
答案:B
The new library building ___________last week.
A.completed
B.was completed
C.is completed
D.has completed
多见于生育期女性,可能是子宫内膜异位症所致()
A.原发性自发性气胸
B.继发性自发性气胸
C.月经性自发性气胸
D.妊娠性自发性气胸
E.张力性自发性气胸