问题 填空题

(7分)A、B、C、D四种元素都位于短周期内,它们的原子序数依次递增, A原子核内仅含有一个质子,B原子的电子总数与D原子最外层电子数相等, A原子与B原子的最外层电子数之和与C原子最外层电子数相等,D原子有2个电子层,最外层电子数是次外层电子数的3倍,且D只能形成阴离子。由此回答:

(1)四种元素的元素符号为:A_________B_________C__________D____________,C在元素周期表的位置                    

(2)由A、D两种元素形成的二种化合物的化学式为____________和______________

答案

⑴ H  C  N  O 第二周期第ⅤA族     ⑵H2O   H2O2

考查原子核外电子的排布规律。A原子核内仅含有一个质子,所以A是氢元素。D原子有2个电子层,最外层电子数是次外层电子数的3倍,则D是氧元素。B原子的电子总数与D原子最外层电子数相等,所以B是碳元素。A原子与B原子的最外层电子数之和与C原子最外层电子数相等,因此C是氮元素。氢和氧形成的化合物是H2O和H2O2

阅读理解

试题类型:阅读理解  试题难度:一般  更新时间:2012/7/9 9:53:57

Nearly all of us have an unpleasant habit, whether we realize it or not, and we want to get rid of it but didn’t know the proper ways. Here’s some advice on how to get rid of bad habits.

n Make a list.   Write down all the reasons why you want to stop a certain behavior----how it’s hurting you and why getting rid of it will help. Look at that list regularly.

n Join other activities.  ②It’s wise of you to do something else when you want to stop your bad habits. If you get angry easily, for example, you can practice deep breathing or go for a walk.

n Give yourself a reward.  Before you get rid of a bad habit, decide what you’ll do to celebrate it if you achieve your goal.

n Keep off bad habits.    If you are fat and want to lose weight, keep junk food(垃圾食品) out of your house. If you are a heavy smoker, keep away from smoky bars or friends who like smoking.

n Be patient.    Bad habits develop over years, so you probably won’t be able to get rid of them quickly. In fact, people often give up several times before being successful, so you should ① ___________  ___________.

n Find support.  Don’t be afraid to ask for support from friends, family or other people who have the same bad habits as you. When you talk to others, they might be able to give you some advice or encouragement that you normally wouldn’t get from yourself.

小题1:在①处横线上填入适当的词。___________ ___________

小题2:将②处划线部分翻译成中文。

小题3:回答问题How many suggestions are offered to help you get rid of bad habits?

小题4:找出并写出所给句子的同义句。

You should be brave enough to get help from your friends, family or other people, because they may have the same bad behavior as you.

小题5:找出并写出最能表达该短文主题的句子。

问答题