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【

【名词&注释】

碳酸氢钠(sodium bicarbonate)、稀硫酸(dilute sulfuric acid)、氧化铁粉(ferric oxide powder)、稀盐酸(dilute hydrochloric acid)、硫酸铜溶液(copper sulfate solution)、质量比(mass ratio)

[单选题]下列各组物质充分反应后，溶液质量比^{(mass ratio)}反应前的溶液质量减小的是【】

A. 铁片浸入稀硫酸中
B. 铁片浸入硫酸铜溶液^{(copper sulfate solution)}中
C. 氧化铁粉末加入稀盐酸中
D. 碳酸氢钠粉末加入稀盐酸中

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学习资料：

[单选题]___________-

A. How to Learn Math
B. How to Communicate with Children
C. How to Teach English Well
D. How to Make the Waste Useful
E. How to Cook Delicious Food
F. F. How to Use the Internet
G. G. How to Be Healthy

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

A. He is twelve
B. He exercises by bus
C. Twice a week
D. About one hour

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

A. Million of
B. Millions of
C. Three millions
D. Three millions of

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