何种口腔不良习惯可在4~6岁以后渐减少而自行消失()。
A.吮指习惯
B.舌习惯
C.唇习惯
D.咬指习惯
E.睡眠习惯
参考答案:A
The athlete fell off his bike when he _____ down the hill. [ ]
A. cycled
B. was cycling
C. had cycled
D. is cycling
交感神经系统活动加强时,不会产生下述哪项结果()
A.瞳孔扩大
B.骨骼肌和心脏血管舒张
C.糖原分解减少
D.支气管扩张
E.汗腺分泌增加