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问题 问答题

某些化学反应可用下式表示：A+B→C+D+H2O．请回答下列问题：

（1）若A、C、D均含有氯元素，且A的化合价介于C与D之间，写出该反应的离子方程式：______．

（2）若C、D均为气体且都能使澄清石灰水变浑浊，则A与B的组合为______．

（3）若A为黑色固体，C是黄绿色的单质气体，写出该反应的离子方程式：______．

（4）若A为Na2O2，B为硫酸，则C和D的化学式为______．

（5）若A、C均含有铝元素．则C可能为______或______．

（6）若A为有颜色的金属单质，B为第二周期某种元素的最高价氧化物的水化物，请写出符合上式的化学方程式：______．

答案

（1）A、C、D中均含有氯元素，且A中的Cl的化合价介于C和D之间，该反应为氯气在碱性条件下的歧化反应，反应的离子方程式为Cl2+2OH-═Cl-+ClO-+H2O，

故答案为：Cl2+2OH-=Cl-+ClO-+H2O；

（2）能使澄清的石灰水变浑浊的气体有SO2和CO2，应为碳和浓硫酸的反应，则A与B的组合为C和浓H2SO4，

故答案为：C、浓H2SO4；

（3）应为MnO2和浓盐酸的反应，生成黄绿色气体为Cl2，反应的离子方程式为MnO2+4H++2Cl-

 △ 
.
 
Mn2++Cl2↑+2H2O，

故答案为：MnO2+4H++2Cl-

 △ 
.
 
Mn2++Cl2↑+2H2O；

（4）若A为Na2O2，B为硫酸，生成Na2SO4和O2，则C和D的化学式为Na2SO4、O2，故答案为：Na2SO4、O2；

（5）若A、C均含有铝元素，生成水，可为AlCl3与过量强碱或NaAlO2与过量强酸的反应，C可能为AlCl3或NaAlO2，

故答案为：AlCl3；NaAlO2；

（6）B为第二周期某种元素的最高价氧化物的水化物，只能为HNO3，则A为Cu，发生反应的方程式为

Cu+4HNO3（浓）=Cu（NO3）2+2NO2↑+2H2O[或3Cu+8HNO3（稀）=3Cu（NO3）2+2NO↑+4H2O]，

故答案为：Cu+4HNO3（浓）=Cu（NO3）2+2NO2↑+2H2O[或3Cu+8HNO3（稀）=3Cu（NO3）2+2NO↑+4H2O]．

阅读理解
Directions: Read the following text and choose the most suitable heading from A-F for each paragraph.
There is one extra heading which you do not need.
A. Drug overuse and its consequence
B. The problem of drug overuse in America
C. Benefits of medicine and its wise use
D. Female drug overuse with reference to that of males
E. Misuse of medicine among the young generation
F. Improper use of medicine among senior citizens
1.______
      Nowadays, millions of people misuse and even overuse pain medications and other drugs. Research by
the American National Institute on Drug Abuse (NIDA, 1999) shows that around 2% of the population over
age 12 were using drugs non-medically.
2.______
     NIDA views medications as a powerful force for good in the contemporary world. They reduce and
remove pain for millions of people suffering from illness and disease. They make it possible for doctors to
perform complicated surgery to save lives. Many people afflicted by serious medical conditions are able to
control their symptoms and become active, contributing citizens. NIDA points out that most individuals who
take these drags use them in a responsible.
3.______
     Nevertheless, overuse of drugs such as opioids, central nervous system (CNS) depressants and stimulants
does lead to harmful reliance in some people and is therefore becoming a serious public health concern.
Although this abuse affects many people worldwide, particular trends of concern to the medical profession in
the US appear among older adults, teenagers arid women.
4.______
     Though it may be a surprise to many, the misuse of medications may be the most common form of drug
abuse among the elderly. Dr Kenneth Schrader of Duke University, North Carolina states that although the
elderly represent about 13% of the US population, those aged 65 and over account for the consumption of one
third of all drugs. People in this age group use medications roughly three times more than the general
population and have poorer compliance with instruction for use. In another study of elderly patients admitted
to treatment programs, 70% were women who had overused medicines.
5.______
     Unfortunately, this trend among women does not only affect those aged over.
     In general, among women and men who are using either an anti-anxiety drug or a sedative, women are
twice as likely to become addicted. In addition, statistics compiled for 12-17 year olds show that teenage girls
are more likely than teenage boys to begin overusing psychotherapeutic medication such as painkillers,
tranquillisers, stimulants and sedatives.
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多项选择题

IT服务提供方通常包括（）

A.电力供应单位

B.直接服务顾客的IT设备供应商

C.IT服务外包方的供应商

D.内部的IT部门
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