中心性浆液性脉络膜视网膜病变的诊断依据()
A.眼前有暗影
B.视力下降,一般低于0.3
C.黄斑水肿
D.视物变形
E.多见于青壮年
参考答案:A, C, D, E
9.With the world changing fast, we have something new with all by ourselves every day.
A.deal
B.dealt
C.to deal
D.dealing
小李买8本练习本.每本a元,付出20元,找回多少元?算式是20-8a.______.