治疗阴虚盗汗,遗精,骨蒸潮热宜选()
A.黄柏
B.黄芩
C.牡丹皮
D.牛黄
E.苦参
参考答案:A
During the seven-day May Day holiday, _____ families went sightseeing. [ ]
A. thousand
B. thousands
C. thousands and thousands
D. thousands of
按照地下水污染的自然属性,地下水污染元可以划分为自然污染源和人为污染源两个类型。