人教版必修五Unit 1 Great scientists 课时作业（10份打包）.zip

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。
A
FIRE-FIGHTING
How to fight a fire
Anyone 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 to put a fire out.
Water extinguishers
You 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 you — 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 fire out yourself. Instead, leave the building immediately, and call the fire brigade.
Foam (泡沫) extinguishers
You 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, 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 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 has been caused by electrical equipment, switch the equipment off and point the extinguisher straight at the fire. If the fire has been caused