June 5 is World Environment Day．This makes us pay more attention to our environment and the need to protect it．

　　When Wang Boxuan, a Yancheng high schoolboy, uses up(用尽)his exercise books, he does not throw them away．Each one is stored at his school with hundreds of exercise books given by other students．Then they are sold to a Yancheng paper making factory．

　　The paper is recycled and used again by students and teachers in the school．At the same time, the money made from the sales goes towards schools in Inner Mongolia for planting trees and grass．This place is one of the sources(源头)of the sandstorms that often attack Beijing during springtime．

　　Wang's school is one of the schools in the city that take part in the “green promise(承诺)”environmental protection activity．So far, nearly 210,000 students have taken part in the activity, collecting more than 87 tons(吨)of waste paper．

　　With the Olympic Games coming to Beijing in 2008, students are eager(渴望)to help make the capital a more pleasant place．

　　“There are some environment problems in the city, such as sandstorms,” said Wang．“We should do our duty and encourage others to do so as well．”

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先通读下面的短文，掌握其大意，然后在每小题所给的四个选项中，选出可以填入空白处的最佳选项。

　　A little boy came up to his mother in the kitchen one evening while she was cooking supper, and 　　1　　 her a piece of paper that he had written something on．After his mother 　　2　　 her hands, she read what on the paper．

　　For 　　3　　 the grass ＄5.00

　　For cleaning up my room this week ＄1.00

　　For going to the supermarket for you ＄1.00

　　For looking after my baby brother while you went shopping ＄1.00

　　For taking out the rubbish ＄1.00

　　For getting a good report card ＄5.00

　　For cleaning up the garden ＄2.00

　　Total：＄16.00

　　Well, his mother looked at him for a while, and then she picked up a pen, turned 　　4　　 the paper he had written on, and this was what she wrote：

　　For the nine 　　5　　 I carried you while you were growing inside me, free．

　　For all the nights that I’ve sat up with you, fed you and sung songs for you, free．

　　For all the tears(眼泪)that you’ve 　　6　　 through the years, free．

　　When you add it up, the cost of my love is free．

　　For all the nights that were filled with 　　7　　 , free．

　　For the toys, food, clothes, and even cleaning your nose, free．

　　And when you add it all up, the 　　8　　 cost of real love is free．

　　When the little boy finished reading what his mother had written, there were tears in his eyes．He looked straight 　　9　　 at his mother and said, “Mom, I sure do love you．” And then he took the pen and in great big letters he wrote：　　10　　 IN FULL．

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