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　　6．  Nuclear energy is beginning to compete with coal as an economical source of power to generate electricity．It is also being used to operate engines in large ships．Scientists continue to seek new and better methods of obtaining and using energy.

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　　A Nuclear Reactions as the Lasting Source of the Sun's Energy

　　B The Most lmportant Source of Energy

　　C Types of Electromagnetic Energy

　　D The Machines Used for Energy Generation

　　E Seeking New Sources of Energy

　　F The Use of Ultraviolet Radiation in Medicine

　　27 One can get a sunburn even              .

　　28 Infrared radiation can produce heat            .

　　29 X-rays and gamma rays can be used to detect and

　　treat cancer           .

　　30 Chemical energy is generated              .

　　A when it is absorbed by matter

　　B when it is cloudy

　　C because they can pass through solid objects

　　D when the sunrays are fierce

　　E when a change in the nucleus of an atom takes place

　　F when electron rearrangement takes place

　　第4部分：阅读理解(第3~45题，每题3分，共45分)

　　下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案涂在答题卡相应的位置上。

　　第一篇     Valuing Childhood

　　The value of childhood is easily blurred(变得模糊不清)in today's world．Consider some recent developments：The child．murderers in the Jonesboro,Ark．schoolyard shooting case were convicted and sentenced．Two boys，7 and 8,were charged in the murder of an 11-year-old girl in Chicago．

　　Children who commit horrible crimes appear to act of their own will．Yet，as legal proceedings in Jonesboro showed，the one boy who was able to address the court couldn't begin to explain his acts．though he tried to apologize．There may have been a motive-youthful jealousy(妒忌)and resentment．But a deeper question remains：Why did these boys and others in similar trouble apparently lack any inner,moral restraint?

　　That question echoes for the accused in Chicago．young as they are．They wanted the girl's bicycle,a selfish impulse common enough among kids．

　　Redemption(拯救)is a practical necessity．How can value be restored to young lives distorted by acts of violence?The boys in Jonesboro and in Chicago will be confined in institutions for a relatively short time．Despite horror at what was done，children are not-cannot be-dealt with as adults．not if a people wants to consider jtself civilized．That's why politicians'cries for adult treatment of youthful criminals ultimately miss the point．

　　But the moral void(真空)that invites violence has many sources．Family instability contributes：So does economic stress．That void．however,can be filled．The work starts wifh

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