医药中,常用酒精来消毒,是因为酒精能够( )
A.使细菌蛋白体发生盐析
B.使细菌蛋白体发生变性
C.与细菌蛋白质发生氧化反应
D.与细菌配合体生成配合物
答案:B
某件商品的标价为1100元,若商店按标价的80%降价销售仍可获利10%,求该商品的进价是多少元?
---What did Jack ask you just now?
--He wanted to know how long ________ when I reached the cinema.
A.had the film been on
B.the film had started
C.the film had lasted
D.had the film ended