下列各组离子能在溶液中大量共存的是 A．K+、H+、SO42-、OH- B．Na

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问题选择题

下列各组离子能在溶液中大量共存的是

A．K⁺、H⁺、SO₄^2-、OH^-

B．Na⁺、Ca²⁺、CO₃^2-、NO₃^-

C．Na⁺、H⁺、C1^-、CO₃^2-

D．Na⁺、Cu²⁺、C1^-、SO₄^2-

答案

题目分析：A中H⁺和OH^-不能共存； B中Ca²⁺和CO₃^2-不能共存；C中H⁺和CO₃^2-不能共存；D中溶液可以大量共存。

听力题

根据下列各句句意和空白之后的汉语提示词，每空只写一词。

小题1:_______________(一般) speaking, the more you remember, the better memory you’ll have.

小题2:I always keep my _____________(祖国) in my heart.

小题3:When it rains,__________(雨伞) of different colours make a beautiful sight.

小题4:We tried to ___________________(劝说) him to give up smoking.

小题5:Teenagers should have a right _______________(态度) towards life.

小题6:CCTV is a responsible and ________________(可信赖的) medium.

小题7:The books you _____(提及) just now can be borrowed from the school library.

小题8:I’m glad to hear that your daughter has been ___________(录取) by Peking University.

小题9:China __________（成功地）feeds 22% of the world’s population with only 7% of the world’s land.

小题10:We can safely draw a_____________(结论) from our discussion.

填空题

片剂包肠溶衣的目的是（）、（）、（）。