题目内容
Electromagnetic Energy
？？ 1. White light seems to be acombination of all colors. The energy that comes from a source of light is notlimited to the kind of energy you can see. Heat is given off by a flame or anelectric light. On a cloudy day it is possible to get a sunburn even though youfeel cool. Visible light and the kinds of energy that produce warmth andsunburn are examples of electromagnetic energy.
？？ 2. The sun is 93 millionmiles from the&39;earth. Yet we can use energy from the sun because electro-magnetic energy travels through space.
？？ 3. Many other kinds ofenergy are also types of electromagnetic energy. Radio, television, and ra- darsignals travel from transmitters to receivers as low-energy electromagneticwaves. 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 thanwaves of radio, television, or radar. Ultraviolet rays（红外线） ahd X-rays areelectromagnetic waves with even greater amounts of energy. Infrared radia- tionis used in cooking fo？？od？？ and heating buildings. Sunlight and electric lights arepart of our require- ments for normal living. Ultraviolet radiation is usefulin killing certain disease organisms. X-rays and gamma rays have so much energythat they travel right through solid objects. They can be used to de- tect andtreat cancer. X-rays are used in industry to find hidden cracks in metal, andin medicine to re-veal broken bones.
？？ 4. Usually we useelectricity to generate electromagnetic energy. The source of most of our energyis the sum Heat from the sun causes water to evaporate. When the water falls tothe earth as rain, some of it is trapped behind dams and then used to operateelectric generators. Other generators are powered？？ by coal, but the energystored in coal came from the sun, too.
？？ 5. Until recently, thesource of the tremendous amount of energy given off by the sun was a puz- zle.If the sun depended on chemical reactions, it would have used up all its energylong ago. Experi- ments with electromagnetic radiation led to the theory thatmass can be converted into energy. About forty years after the theory wasproposed, nuclear energy was harnessed (利用) by man. Chemical en- ergy comes from electron (电子) rearrangement. Nuclear ene？？rgy comes from a change in the nucleus of anatom. Compared with chemical reactions, nuclear reactions release millions oftimes more energy per pound of fueL Wenow believe that the sun&39;s energy comes from the nuclear reactions in which hy-drogen is changed into helium (氦）.
？？ 6. Nuclear energy isbeginning 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 toseek new and better methods of obtaining and using energy.？？
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？？Visible light that produce warmth is an example of_____？？
？？We can use energy from the sun because________？？
？？The energy stored in coal_______.？？
？？___________when electron rearrangement takes place？？
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Parkinson&39;s Disease
l. Parkinson&39;s diseaseaffects the way you move. It happens when there is a problem with certain nervecells in the brain Normally, these nerve cells make an important chemicalcalled dopamine. Do- pamine sends signals to the part of your brain that controlsmovement. It lets your muscles move smoothly and do what you want them to do.When you have Parkinson&39;s, these nerve cells break down. Then you no longerhave enough dopamine, and you have troubje moving the way you want to.
2. No one knows for sure whatmakes these nerve cells break down_ But scientists are doing a lot of re-search to look for the answer. They are studying many possible causes,including aging and poisons in the en- vironment. Abnormal genes seem to leadto Parkinson&39;s disease in some people But so far, there is not enough proof toshow that it is always inherited
3. Tremor may be the first symptom you notice.It is one of the mostcommon signs of the disease,although not everyone has it. More importantly, noteveryone with a tremor has Parkinson&39;s disease.Tremor often starts in just onearm or leg or only on one side of the body. It may be worse when you are awakebut not moving the affected arm or leg. It may get better when you move thelimb or you are asleep. In time, Parkinson&39;s affects muscles all through yourbody, so it can lead to problems like
trouble swallowing or constipation. In the later stages of the disease,a person with Parkinson&39;s may have a fixed or blank expression, troublespeaking, and other problems. Some people also have a de- crease in mentalskills (dementia).
4. At this time, there is nocure for Parkinson&39;s disease. But there are several types of medicines that cancontrol the symptoms and make the disease easier to live with. You may not evenneed treat- ment if your symptoms are mild. Your doctor may wait to prescribemedicines until your symptoms start to get in the way of your daily life. Yourdoctor will adjust your medicines as your symptoms get worse. You may need totake several medicines to get the best results.
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三、为了维护M县的声誉，挽回“虐猫事件”造成的负面影响，请以M县政府的名义就“虐猫事件”的处理情况写一份宣传稿，在县人民政府网站公布。(25分)
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？？？？？？50？？？？？？
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要求：(1)联系实际，论述深刻；(2)语言流畅，条理清晰；(3)总字数不少于800字。
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