离心泵在启动时，应（）。
A.出口阀在打开状态
B.出口阀在关闭状态
C.出口阀在打开、关闭状态均可
参考答案：B
The information on the Internet gets around much more rapidly than ______ in the newspaper.
A．it
B．those
C．one
D．that
Passage 1
