Two-thirds of his property_____lost in the fire.
A. was
B. were
C. are
D. have been
William has cut his smoking_____to five cigarettes a day.
A. down
B. short
C. away
D. off
在关系数据库中,用来表示实体问联系的是()
A. 属性
B. 二维表
C. 网状结构
D. 树状结构
升浮的药物能()
A. 平喘
B. 潜阳
C. 发汗
D. 利尿