题目

北京时间3月11日13点46分，日本海域发生了里氏9.0级强震，不仅造成了巨大的人员财产损失更直接导致了福岛核电站的核泄漏事故，在全球引起了核恐慌，许多国家都已检测出来自福岛核泄漏的放射性131I，下列说法正确的是 A.碘是第四周期元素                  B. 131I2 与127I2互为同素异形体 C．131I的中子数是78                 D.碘元素的近似相对原子质量为131  根据对话内容，从方框中选择恰当的选项补全对话。A: What do you think is the most useful invention?B: 【1】A: Why do you think so? B: Because it allows people to talk to friends, share photos, ideas and feelings freely. 【2】A: Haha ... I also think it is a great invention. 【3】B: Yes. If I don't pass my math exam, I will write “I feel sad today. I didn't pass my math exam.” 【4】 What about you? What do you like doing on WeChat?A: I like sharing my birthday party photos, pictures of my new clothes and so on with my friends. It is fun.B: But sometimes criminals use WeChat. 【5】A: That's true. So we should use it properly.B: I agree.A. Do you often write anything on WeChat?B. Then many friends will comfort (安慰) me.C. WeChat of course.D. They try to cheat people out of money.E. It is fast, convenient and fashionable.A. Do you often write anything on WeChat?B. Then many friends will comfort (安慰) me.C. WeChat of course.D. They try to cheat people out of money.E. It is fast, convenient and fashionable.