分别将下列各组物质放入水中，能发生化学反应，但反应中既无沉淀_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

分别将下列各组物质放入水中，能发生化学反应，但反应中既无沉淀生成，又无气体放出的是（　　）

A．CaCl₂、KOH、Na₂CO₃

B．Na₂SO₄、H₂SO₄、NaOH

C．K₂CO₃、CaCl₂、HCl

D．CaCl₂、HNO₃、NaCl

答案

答案：B

填空题

A. But I argued with my best friend yesterday. B. That’s a good idea.
C. I don’t have enough time. D. What should I do? E. I’ll try to apologize (道歉) to her.

A: I want to get good grades.     34
B: Maybe you could attend after-school class on weekends.
A:     35   I have to do my homework on weekends.
B: Well, you could ask your friends for help.
A:     36
B: You should say “sorry” to your friend.
A: OK.    37
B: I think you shouldn’t play computer games or watch TV any more.
A:     38   I’ll study harder and harder from now on.

单项选择题

下图中，A、B、C、D四地位于同一纬度，其昼夜温差最小的是（）

A.A

B.B

C.C

D.D