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1、Unit 1 Great scientists reading课时作业第一节（共15小题; 每小题2.5分，满分37.5分） 阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。 AFIRE-FIGHTINGHow to fight a fireAnyone who uses fire-extinguishers should know a few basic facts about how to make them work. This leaflet will tell you the most important things to remember if you have
2、to put a fire out.Water extinguishersYou can put most fires out with water extinguishers. However, you should not use water extinguishers if the fire involves electrical equipment or if it has been started by flammable (易燃的) liquids such as petrol.As in all fires, make sure that the wind is behind y
3、ou if you do this, the smoke will blow away from you. Point the jet of water at the bottom of the fire and move it slowly higher.Remember that you should only use extinguishers for small fires. If there is any danger of the fire spreading to anything that can explode, you should not try to put the f
4、ire out yourself. Instead, leave the building immediately, and call the fire brigade.Foam (泡沫) extinguishersYou can use a foam extinguisher for fire caused by burning liquids such as petrol. Never point the jet directly into the liquid itself, as this may make it splash and spread the fire. Instead,
5、 try and point the extinguisher up into the air so that the foam goes up and falls on top of the burning liquid. Whatever the kind of fire, do not stand up straight if you can stay down, this will help you to avoid the smoke, and you may be able to get closer to the fire. Get out of the building at
6、once if you think your escape route might be cut off by smoke or fire. Carbon Dioxide (CO2) extinguishers Some fire extinguishers are filled with a gas called carbon dioxide. You can use these to put out fires which have been caused either by electrical equipment or flammable liquids. If the fire ha
7、s been caused by electrical equipment, switch the equipment off and point the extinguisher straight at the fire. If the fire has been caused by a liquid like petrol, point the extinguisher at the nearest edge of the fire, and move it from side to side. Remember, never stay in a building if it is dan
8、gerous to do so, or if the fire grows beyond your control. Make sure you are standing near an exit in case this happens.1Which of the following statements is NOT TRUE according to the passage?AYou cannot put all fires out with water extinguishers.BIn case of fire, stay down to protect yourself from
9、the smoke.CIf the fire might cause any further explosion, ask for professional help.DFoam extinguishers are for fires caused by electrical equipment.2What can be inferred from the passage?AInappropriate use of fire extinguishers might make things worse.BYou should stay in the building if your escape
10、 route is cut off.CStanding close to an exit will absolutely guarantee your safety in a fire.DFirefighting is a complicated job that can only be done by fire brigades.3Who is the potential target reader of this passage?AFire fighters.BThe general public.CCollege professors. DYoung children.B Mark Tw
11、ain, the famous American writer, liked to play jokes on others. But once a joke was played on him. One day Mark Twain was invited to give a talk in a small town. At lunch he met a young man, one of his friends.The young man said that he has an uncle with him. He told Twain that his uncle never laugh
12、ed or smiled, and that nobody and nothing was able to make his uncle smile or laugh.You bring your uncle to my talk tonight, said Mark Twain. Im sure I can make him laugh.That evening the young man and his uncle sat in the front. Mark Twain began to speak. He told several funny stories. This made ev
13、eryone in the room laugh.But the man never even smiled. Mark Twain told more funny stories, but the old man still kept quiet. Mark Twain told his funny stories. Finally he stopped. He was tired and quite disappointed(失望的)Some days later, Mark Twain told another friend of his about what had happened.
14、Oh, said his friend. I know that old man. Hes been deaf(聋)for years.4Mark Twain liked to play jokes on_.AhimselfBothersCold menDAmericans5One day Mark Twain met_ at lunch.Aa friendBa young mans uncleCa young girlDa deaf6The young man told Mark Twain that his uncle never_.AspokeBtalkedClaughedDate7Ma
15、rk Twain stopped telling stories at last because he was_.AthirstyBtiredCangryDsleepyCThough it is not good for us to expose ourselves to sunlight for too long, allowing ourselves appropriate amount of exposure to sunlight gives us many benefits and affects us in a number of ways.Without the sun, life would not have developed. It gives us energy and heats our world. The sun gives us light and thus in turn we are able to see the beautiful colors in our world. It makes us feel good when we feel the warmth of its rays on our shoulders. We store the energy from the sun to help build and heat
