正确答案: B

铁片浸入硫酸铜溶液中

题目：下列各组物质充分反应后，溶液质量比反应前的溶液质量减小的是【】

解析：B

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学习资料的答案和解析：

[单选题]___________-

How to Cook Delicious Food

[单选题]—How often does he exercise?— ________.

Twice a week

[单选题]5．—How many people will come to Shanghai next month?—It's hard to say．_______ people，l think．

Millions of

解析：5.B【解析】当hundred、thousand、milli。n等词前加数词时应用单数，后加介词of时，要用复数形式，故答案为B。