低速气流流经扩张管道时，（）。
A.速度增加、压力增加
B.速度减小、压力减小
C.速度减小、压力增加
D.速度增加、压力减小
参考答案：C
The doctor is skilled at treating heart trouble and never accepts any gift from his patients, so he has a very good _____[ ]
A. expectation
B. reputation
C. contribution
D. civilization
The young woman feels about her baby.[ ]
A. to worry
B. worrying
C. worry
D. worried
