阅读材料, 判断所给句子的正误,正确的选 A,错误的选B。 June 5 th is World Environment Day. This makes us pay more attention to our environment . When Wang Boxuan, a Beijing high schoolboy , uses up his exercise-books , he does not throw them away . Each one is kept at his school, together with hundreds of exercise-books that are given by other students . Then they are sold to a paper making factory in Beijing . The paper is recycled and used again by students and teachers in the school . At the same time , the money that is made from the sales goes to poor areas . People there use the money to plant more trees and grass . Sandstorms( 沙尘暴 ) from this place often do harm to Beijing in spring . Wang's school is one of the schools in the capital that take part in the "Green Promise" environmental protection activity . So far , nearly 80% of the students have joined in the activity and collected more than 87 tons of waste paper . ( ) 61.World Environment Day is on July 5th . A. True B. False ( ) 62. Wang Boxuan and his schoolmates keep and sell used exercise-books . A. True B. False ( ) 63. The money made from the sales is used to help poor students . A. True B. False ( ) 64. Sandstorms are harmful to Beijing . A. True B. False ( ) 65. All the students have joined in the activity, collecting over 87 tons of waste paper . A. True B. False