含细菌和灰尘的痰液产生于 A、鼻腔黏膜 B、食道黏膜 C、喉腔侧壁 D、气管和支气管黏膜
设集合P={m|-1＜m＜0}，Q={m∈R|mx2+4mx-4＜0,对任意实数x恒成立}，则下列 关系中成立的是（ ） A． PQ B．QP C．P=Q
如图，等腰梯形ABCD中，AD∥BC，BD平分∠ABC，∠DBC=30°，AD=5，则BC等于（ ）．A．5 B．7.5 C． D．10
-- What was Jim wearing at the party? -- Nothing ____. He was in his usual shirt and jeans. A.special B.simple C.important D.inter
Polar bears live on sea ice，which they use as a platform for hunting seals. A．most B．almost C．nearly D．mostly
In my opinion, all Mr Tom ______ good to his students in his class at present. He is very strict in their study. A. does does does B. does do do C. does does do D. did
There a football match this afternoon. A. have B. has C. is going to have D. is going to be
为
B．
D．
