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问题 选择题

下列说法正确的是

A．原子中，核内中子数与核外电子数的差值为143

B．纯碱、和生石灰分别属于盐、混合物和氧化物

C．凡是能电离出离子的化合物都是离子化合物

D．、硫酸钡和水分别属于非电解质、强电解质和弱电解质

答案

答案：D

单项选择题

One afternoon, my son Adam asked me, "Are all people the same even if they are different in color " I thought for a minute, and then I said, "I’ll explain,（1）you can just wait until we make a quick stop at the grocery store. I have something （2） to show you. "At grocery store, we bought some apples-red, green and yellow ones. Back home, I told Adam, "It’s time to（3） your question." I put one apple of each type on the table. Then I looked at Adam, who had a （4） look on his face."People are like apples. They come in all different colors, shapes and sizes. On the（5）, some of the apples may not even look as the others. " As I was talking, Adam was（6）each one carefully. Then, I took each of the apples and peeled them, placing them back on the table, but （7） a different place."Okay, Adam, tell me which is which." He said, "I can’t tell. They all look same now." "Take a bite of （8）. See if that helps you decide which one is which. "He took（9） , and then a huge smile came cross his face. "People are just like apples! They are all different, but once you（10）the outside, they’re pretty much the same on the inside. "He totally got it. I didn’t need to say or do anything else.

第（4）空应选择（）

A. worried

B. satisfied

C. proud

D. curious
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问答题 简答题

人口的社会变动
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