（2011年四川绵阳，14题）下列实验操作不符合规范的是（   ）

A．点燃可燃性气体之前检验气体的纯度

B．蒸发滤液时用玻璃棒不断搅拌滤液

C．通过口尝来确定实验室中某种试剂的味道

D．用酒精灯加热试管里的固体时先预热

She spent 25 dollars on the watch chain.It means ___.

A．she paid 25 dollars on the watch chain

B．the watch chain cost her 25 dollars

C．it took her 25 dollars buying the watch chain

D．she bought the watch chain of 25 dollars