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In 1620, about half the USA as covered by forests． Today the forests have almost gone． A lot of good land has gone ith them, leaving only sand． doesn't ant to copy the USA's example． We're planting and trees． We've built the " Great Green Wall" of trees across northern part of our country．The Great Green Wall is 7,000 kilometres long, and bet een 400 and 1,700 kilometres ide． It ill stop the ind from blo ing the earth a ay． It ill stop the sand from moving to ards the rich far in the south． More "Great Green Walls" are needed． Trees must be gro n all over the orld． Great Green Walls ill make the orld better． 根据短文内容，选择正确答案。 1．In 1620, about ______ the USA as covered by forests． A．a third B．half C．t o thirds D．a fourth 2．A lot of good land has gone ith ______． A．sand B． ater C． ind D．forests 3．The Great Green Wall in is ______ long． A．7,000 kilometers B．1,700 kilometers C．7,000 meters D．400 kilometers 4．Trees must be gro n in ______. A． B．the USA C．some countries D．ry part of the orld 5．______ ill make the orld better． A．The Great Wall B．Tall buildings C．Great Green Walls D．Flo ers and grass KEY: 1．B 2．D 3．A 4．D 5．C 中学生 优秀 作文网 ( )
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