I think he is a student, ______? [ ]
A. don't I
B. isn't he
C. is he
D. do I
答案:B
A.A飞机飞得快
B.A飞机飞得慢
C.A飞机飞得高
D.A飞机飞得低
对呼吸系统有毒性的药物是()
A.马钱子
B.蟾酥
C.关木通
D.枳实
E.苦杏仁