In 1620, about half the USA was1 covered2 by forests3. Today the forests have almost4 gone. A lot of good land5 has gone with them, leaving only sand. China doesn''t want to copy6 the USA''s example. We''re planting more and more trees. We''ve built7 the " Great Green Wall" of trees across8 northern9 part10 of our country.The Great Green Wall is 7,000 kilometres11 long, and between 400 and 1,700 kilometres wide12. It will stop the wind from blowing the earth13 away. It will stop the sand from moving towards14 the rich farmland15 in the south. More "Great Green Walls" are needed. Trees must be grown all over the world. Great Green Walls will make the world better.
根据短文内容,选择正确答案。
1.In 1620, about ______ the USA was covered by forests.
A.a third B.half C.two thirds D.a fourth
2.A lot of good land has gone with ______.
A.sand B.water C.wind D.forests
3.The Great Green Wall in China is ______ long.
A.7,000 kilometers16 B.1,700 kilometers
C.7,000 meters17 D.400 kilometers
4.Trees must be grown in ______.
A.China B.the USA
C.some countries D.every part of the world
5.______ will make the world better.
A.The Great Wall B.Tall buildings
C.Great Green Walls D.Flowers and grass
KEY: 1.B 2.D 3.A 4.D 5.C