知母的性能特点包括（）
A.苦寒清热，甘润滋阴
B.苦辛而寒，清泄散郁
C.上能清肺滋燥
D.中能清胃生津
E.下能滋阴降火
参考答案：A, C, D, E
Is it only recently ___ he has had a family himself?
A．when
B．if
C．that
D．which
CT扫描，正常前列腺上限一般不超过耻骨联合上缘的（）
A.30mm
B.20mm
C.10mm
D.40mm
E.以上都不是
