充气设备在耐压试验前应处于（）。
A.额定压力范围
B.正常压力范围
C.排空气体
D.最大压力
参考答案：A
Jack never ____________ homework after dinner. [ ]
A. doesn't
B. does
C. do
The UN is trying to ______ the world ________ hunger.
A．rid; of
B．get rid of; by
C．be rid of ;by
D．get rid; of
