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第三部分：阅读理解
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
A
Recycling is nothing new． Waste paper, rings, and many other things have been recycled and used again in many different ways for many years． It is only the word that is new． But now that natural materials（原料）are becoming more difficult to find, many countries are experimenting with other ways of keeping materials．
In the U. S. A, a publishing firm has brought out several books on pollution and waste in the United States． The books are made of recycled paper—that is paper that has been used as paper before． In this way, several thousand trees are saved． Multiply（乘） those books by hundred, or even a thousand, and the whole forests are saved． One clever schoolboy has worked it out that if every schoolbook in the U．S．A． was recycled, there would be enough paper for fifty packets of peanuts（花生）for every child in the world for five years． He does not say where the peanuts are to come from．
Several firms are experimenting with making containers（集装箱）from a hard plastic which, when the containers are finished, can be used as building materials, a kind of brick． If mountains of empty cans all over the world can be changed into building materials that are not too expensive, that too, is a new source（来源）of material．
1．What is recycling？It is ________．
A．to invent something B．to produce and make
C．to use materials for the second time D．to discover and use
2．Since natural materials are becoming ______, people are finding ways of making use of the waste materials．
A．more valuable B．more useful C．more expensive D．more difficult to find
3．From the passage, children are more likely to reuse ________．
A．the paper for schoolbooks B．packets of peanuts C．containers D．plastic
4．The writer guesses that ________．
A．people will pay less and less money for the house B．children will have more and more peanuts to eat
C．there will be empty cans all over the mountain D．people will no longer need to build a house
B
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