题目

3Cu+8HNO33Cu(NO3)2+2NO↑+4H2O反应中，________是氧化剂；________是还原剂；________元素被氧化；________元素被还原；________是氧化产物；________是还原产物；被还原的HNO3与参加反应的HNO3物质的量之比是________。 答案：解析：根据给定的反应可知铜的化合价由0上升至+2，硝酸中氮元素的化合价由+5降低到+2，所以硝酸是氧化剂，铜是还原剂。答案：HNO3 Cu Cu N Cu(NO3)2 NO 1∶4I am a person who can get angry easily. But since I read an article    1  by my English teacher, things have changed a lot. I’m    2  at a boarding (寄宿的) school. So I  3  learn not only how to study well, but also how to   4  with others. Some of us are outgoing  5 others are quiet. It is   6   that people have problems and arguments. So how can we be tolerant（宽容的，容忍的）? Smiling   7 others is the easiest way. Another way is  8  if your ideas are reasonable (有道理的) and right   9  having an argument. If others’ ideas are really not good, keep an open mind. Try 10  them.   11  a friend is much better than having an enemy after all. Also   12  point out other’s mistakes in public. This will make people lose   13  and get angry. If you really want to help, send a letter instead. On the other hand, if    14  points out your disadvantages, don’t be angry. Just think this is a person who really __15___to help you and become friends. Remember: Tolerance makes life easier.【小题1】A．writeB．was writtenC．writtenD．to write【小题2】A．workingB．teachingC．writingD．studying【小题3】A．canB．have toC．couldD．will【小题4】A．get onB．catch upC．talk aboutD．keep up【小题5】A．whileB．whenC．ifD．that【小题6】A．commonB．unusualC．rightD．wrong【小题7】A．atB．withC．toD．of【小题8】A．thinkB．thinkingC．to thinkD．say【小题9】A．afterB．whenC．untilD．before【小题10】A．laugh atB．excuseC．to laughD．to excuse【小题11】A．HaveB．To haveC．HavingD．Had【小题12】A．Don’tB．NotC．Doesn’tD． /【小题13】A．headB．armC．faceD．money【小题14】A．anyoneB．someoneC．noneD．nobody【小题15】A．wantB．wantedC．wantsD．to want