60．______ will make the world better．

A．The Great Wall　　　 B．Tall buildings

C．Great Green Walls　　 D．Flowers and grass

59．Trees must be grown in ______.

A．China　　　　　　 B．the USA

C．some countries　　　 D．every part of the world

58．The Great Green Wall in China is ______ long．

A．7,000 kilometers　　　 B．1,700 kilometers

C．7,000 meters　　　　 D．400 kilometers

57．A lot of good land has gone with ______．

A．sand　　 B．water　　 C．wind　　 D．forests

56. The writer must think her mother is a _______ woman.

　　 A. famous　 　　　　　　　B. free

C. rich　　　　　　　　　 D. great

E

In 1620, about half the USA was covered by forests． Today the forests have

almost gone． A lot of good land has gone with them, leaving only sand． China

doesn't want to copy the USA's example． We're planting more and more 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 between 400 and 1,700 kilometres wide． It will stop the wind from blowing the earth away． It will stop the sand from moving towards the rich farmland 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．

55. From the last paragraph of the passage we know that _______.

　　 A. the writer is afraid of her mother

　　 B. the writer is proud of her mother

　　 C. the writer feels sad about her mother

　　 D. the writer feels sorry for her mother