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问题 选择题

生活中常见的物质中属于溶液的是（　　）

A．

B．

C．

D．

答案

答案：D

选择题
— Why was the factory closed? 
— The workers have put down their tools and are refusing to work overtime unless they _____ extra for it.

A. will be paid
B. are paid
C. pay
D. are being paid
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选择题

除去下列物质中的少量杂质（括号里为杂质），所选用试剂及操作方法均正确的是（　　）

A．CO2（CO）    过量O2点燃

B．CuO（Cu）    适量稀盐酸      溶解、过滤、洗涤、干燥

C．NaCl溶液（CaCl2）     适量Na2CO3溶液     过滤

D．稀硝酸（H2SO4）    适量BaCl2溶液    过滤
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