第3部分：概括大意与完成句子  (第23～30题，每题1分，共8分)

　　阅读下面这篇短文，短文后有2项测试任务：(1)第23~26题要求从所给的6个选项中为第3～6段每段选择1个正确的小标题；(2)第27~30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上。

　　Electromagnetic Energy

　　1．White light seems to be a combination of all colors．The energy that comes from a source of light is not limited to the kind of energy you can see．Heat is given off by a flame or an electric light．On a cloudy day it is possible to get a sunbam even though you feel coo1．Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy．

　　2．The sun is 93 million miles from the earth．Yet we can use energy from the sun because electromagnetic energy travels through space．

　　3．Many Other kinds of energy are also types of electromagnetic energy．Radio，television，and radar signals travel from transmitters to receivers as low-energy electromagnetic wavesl Infrared(红外线的)radiation is an electromagnetic wave．When it is absorbed by matter．heat is produced.Waves of infrared and visible light have more energy than waves of radio，television，or radar.Ultraviolet rays(紫外线)and X-rays are electromagnetic waves with even greater amounts of energy．Infrared radiation is used in cooking food and heating buildings．Sunlight and electric lights are part of our requirements for normal living．Ultraviolet radiation is useful in killilag certain disease organisms．X-rays and gamma rays have so much energy that they travel right through solid obieets．They can be used to detect and treat cancer．X-rays are used in industry to find hidden cracks in metal．and in medicine to reveal broken bones．

　　4．  Usually we use electricity to．generate electromagnetic energy．The source of most of our energy is the sun．Heat from the sun causes water to evadorate．When the water falls to the earth as rain．some of it is trapped behind dams and then used to operate electric generators．Other generators are powered by coal，but the energy stored in coal came from the sun，too．

　　5．Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle．If the sun depended on chemical reactions．it would have used up all its energy long ago．Experiments with electromagnetic radiation led to the theory that mass can be converted into energy．About forty years after the theory was proposed，nuclear energy was hamessed(利用)by man.Chemical energy comes from electron(电子)rearrangement．Nuclear energy comes from a change in the nucleus of an atom．Compared with chemical reactions，nuclear reactions release millions of times more energy per pound of fuel．We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium (氦)．

　　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.

　　23 Paragraph 3_________.

　　24 Paragraph 4_________.

　　25 Paragraph 5_________.

　　26 Paragraph 6_________.

　　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