Hi, Danny! Look __________ this postcard.[ ]
A. at
B. in
C. on
答案：A
-What __________ you __________ at 6：00 yesterday evening?
-I was watching TV with my parents.
A. did, do
B. were, doing
C. are, doing
D did doing
混合性聋的特征是（）。
A.中耳、内耳病变同时存在
B.病变影响声波传导与感受造成听力障碍
C.混合性聋可由同一疾病引起
D.治疗混合性聋时，应分别处理中耳、内耳病变
E.混合性聋亦可因不同疾病引起
