In 1620, about half the USA was covered by forests. But today many forests have gone. China doesn’t want to copy the USA’s example. We are planting more and more trees. We have 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 earth away. More “Great Green Walls” are needed. Trees must be grown all over the world. The Great Green Walls will make the world better.

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1. In 1620, about ______ of the USA was covered by forests.

A    17%

B    40%

C    50%

D    70%

2. How long is the Great Green Wall?

A    400 kilometers.

B    700 kilometers.

C    2,100 kilometers.

D    7,000 kilometers.

3. Which of the following is TRUE?

A    The wall stops the wind from blowing earth away.

B    We are planting fewer and fewer trees.

C    China wants to copy USA’s example.

D    We built the “Great Green Walls” in northern China.

4. Where should trees be planted?

A    In the USA.

B    In China.

C    In northern China.

D    All over the world.

5. _____ will make the world better.

A    Tall buildings

B    The Great Wall

C    The Great Green Walls

D    Flowers and animals