What has happened to the forests of the U.S.A. in the last 350 years? In 1620. about half the U.S.A. was covered by forests. In 1850, about a third was covered by forests. Today the forests have almost gone. But too many trees are still being cut down. There is a lot of sand left. China doesn't want to follow the U. S. A.'s example. So China has built a new Great Wall across the northern part of China, This time, it is a "Great Green Wall" of trees, millions of trees. The Great Green Wall is 7,000 kilometers long, and between 400 and 1,700 kilometers wide. The Green Wall will stop the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland in the south. But more "Great Green Walls" are still needed, and not only in China. They must be built all over the world.

(1)How much of the U.S.A. was covered by forests 230 years after 1620?

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A．Three quarters of the U. S. A.

B．Half of the U.S.A.

C．One third of the U.S.A.

D．One fourth of the U.S.A.

(2)What is the Great Green Wall?

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A．An ancient, long wall with towers.

B．Millions of trees.

C．A large area of trees.

D．Hundreds of trees.

(3)How can we stop the wind from blowing the earth away?

[　　]

A．Build more walls.

B．Remove the sand.

C．Plant more trees.

D．Reduce the wind.

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.
根据短文内容，选择正确答案。
【小题1】The Great Green Wall in China is ______.

A．7,000 kilometers long	B．1,700 kilometers long
C．7,000 meters long	D．400 kilometers long

【小题2】Trees must be grown in ______.

A．China

B．the USA

C．some countries

D．every part of the world

【小题3】Which of the following statements is not true?

A．The Great Green Wall will stop wind from blowing the earth away.

B．The Great Green Wall will make our life better.

C．We don’t need to plant more trees.

D．The Great Green Wall will stop the sand moving towards the rich farmland.

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 kilometers long, and between 400 and 1,700 kilometers 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．

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 kilometers                             B．1,700 kilometers

C．7,000 meters                              D．400 kilometers

4．Trees must be grown in ______.

A．China      B．the USA     C．some countries    D．every part of the world

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 tress .We’ve built the “Great Green Wall ”of tress across northern pat of our country .The “Great Green Wall”is 7,000 kilometers long ,and between 400 and 1,700 kilometers 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 Wall ”are needed .Trees must be grown all over the world. “Great Green Wall ”will make the world better .
根据短文内容，选择正确答案。
【小题1】In 1620 ,about_____ the USA was covered by forests

A．a third

B．half

C．to thirds

D．a fourth

【小题2】 A lot of good land has gone with _____.

A．sand

B．water

C．wind

D．forests

【小题3】 The “Great Green Wall”In China is _____long

A．7,000 kilometers	B．1,700 kilometers
C．7,000 meters	D．400 kilometers

【小题4】 Trees must be grown in _____.

A．China	B．the USA
C．some countries	D．every part of the world

【小题5】_____ will make the world better .

A．the Great Wall	B．Tall buildings
C．Great Green Wall	D．Flowers and glass