试题与答案

随着人们对物质组成研究的深入,物质的分类也更加多样化。下列说法正确的是 A.Na

题型:选择题

题目:

随着人们对物质组成研究的深入,物质的分类也更加多样化。下列说法正确的是

A.Na2O2、Al2O3、Fe2O3都是碱性氧化物

B.CH3COOH、NH3·H2O、HClO都是弱电解质

C.磁铁矿、铝土矿、绿矾都是混合物

D.烧碱、纯碱、熟石灰都是碱

答案:

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The Internet has become part of young people’s life. ____小题1:____ report shows that 38% of students often use the Internet. Most of them get _____小题2:____ (use) information on the Internet ____小题3:____ use the Internet to help in their studies. But many students don’t use it _____小题4:____ a good way. Some play games too much, some visit websites ____小题5:____ shouldn’t look at. So bad things may happen ____小题6:___ students spend too much time on the Internet.

  _____小题7:____ is important for students to use the Internet properly. Now we have a textbook, _____小题8:____ uses many examples to teach students some good ways to use the Internet. It gives useful advice.

  Some students also make ____小题9:____ on the Internet. But if you want to have a face-to-face ____小题10:_____ (meet) with your online friends, let your parents know and meet in a proper place.

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