租赁合同的租赁期限不得超过( )年，如有超过部分无效。
A．10B．20C．30D．50
参考答案：B
— When did the computer crash?
— This morning, while I ______ the reading materials downloaded from some websites. [ ]
A. have sorted
B. was sorting
C. am sorting
D. had sorted
处方中"每日3次"的缩写词是（）
A.B.i.D.
B.q.i.D.
C.i.D.
D.q，D.
E.t.i.D.
