颞颌关节紊乱综合征的诱发因素有()
A.外力撞击
B.咬硬物
C.牙龈炎
D.中耳炎
E.精神紧张
参考答案:A, B, E
Hurry up! The train_______. You know, it________at 8: 30 am.
A.leaves; leaves
B.is leaving; leaves
C.leaves; is leaving
D.is leaving; is leaving
新疆出血热的传播媒介主要是什么?()
A、蚊子
B、蜱
C、蚤
D、虱