3!(3-1)!=3•2!2!=3．
故答案为3．
. We are trying to ring you back, Harry, but I think we ______ your number incorrectly.
A．looked up
B．worked out
C．took down
D．brought about
患者，男，50岁，，咳喘20余年，现咳嗽痰少，口燥咽干，形体消瘦，腰膝酸软，颧红盗汗，舌红少苔，脉细数。其病机是
A．肺气虚损B．肺阴虚亏C．肺肾阴虚D．肺肾气虚E．肾气虚衰
