流行性腮腺炎的潜伏期平均为( )
A.14天
B.18天
C.20天
D.24天
参考答案:B
赤道地区一般雨量很大,原因是:
A 多锋面气旋活动;
B 受寒流影响,降温减湿
C 近地面盛行西风;
D 近地面气温高,空气膨胀上升;
—________
—I felt unhappy. I broke my glasses. [ ]
A. What do you think of it?
B. What's the matter with you?
C. Why not go to see a movie?
D. How do you like the film?