若a>0,b <0,|a|<|b|,则a与b的和是 [ ]
A.-|a|-|b|
B.-(|a|-|b|)
C.|a|+|b|
D.-(|b|-|a|)
答案:D
John couldn’t take part in the activity held at the cultural center yesterday for _____ reasons.
A.series of
B.all kinds
C.the number of
D.a variety of
治湿热黄疸,首选的药物是()
A.茵陈
B.龙胆草
C.黄柏
D.金钱草
E.黄连