从1925年—1955年的30年间，雷达、电视、核反应、原子弹、晶体管、太阳电池六项

信息归纳(本部分为5小题，每小题1分，共5分)
Hundreds of years ago, life was much harder than it is today. People didn’t have modern machines. There were no modern machines, either. Life today has brought new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills fish and affects(影响) our drinking water. Noise pollution makes us talk louder and louder. Air pollution is the most serious kind of pollution. It affects every living thing in the world.
The world is not only hungry, but it is also thirsty for water. Only if we take steps to deal with this problem now can we avoid(避免) a serious worldwide water shortage later on. We all have to learn how to stop wasting our valuable water. One of the first steps is to develop ways of reusing it. But even if we purified(净化) and reused the water, we still would not have enough. All we’d have to do is to make use of the vast reserves(储备) of sea water in the world is to remove the salt.
Paper comes from trees. We use a lot of paper every day. If we keep on wasting so much paper, there will not be any trees left on the earth. So how can we save paper? We can use both sides of every piece of paper, especially when we are making notes. We can choose drinks in bottles instead of those in paper packets. We can also use cotton handkerchiefs(手帕) and not paper ones. When we go shopping, we can use fewer paper bags. If the shop assistant does give us a paper bag, we can save it and reuse it later.
Information card

Three kinds of main pollutions today	小题1:.
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A serious worldwide problem we’re going to face	小题4:
How many ways are mentioned(提到) to save paper?	小题5: