白虎汤中石膏与知母合用，能增强（）之功。
参考答案：清热生津
. ________ is no doubt that your world is becoming smaller, due to the technological advance made by the computer.
A．There
B．It
C．That
D．This
《煤矿安全规程》对主要通风机停风是怎样规定的？
