In1620,abouthalftheUSAwascoveredbyforests.In1850,aboutathirdwascoveredbyforests.Todaytheforestshavealmostgone.Alotofgoodlandhasgonewiththem,leavingonlysand.TodaytoomanytreesarestillbeingcutintheUSA

Question

　　In 1620, about half the USA was covered by forests. In 1850, about a third was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. Today too many trees are still being cut in the USA.
　　China does not want to copy the USA's example. So China has built a new Great Wall across the northern part of the country. This time it is a “Great Wall” of trees, millions of trees.
　　The Great Green Wall is 7,000 kilometers long, and between 400 and 1,700 kilometers wide. The Great 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. It has already saved a lot of land. But more “Great Green Walls” are still needed, and not only in China. They must be built all over world.

About ________ the USA's forests went from 1620 to 1850.

• A

  half
• B

  a third
• C

  a sixth
• D

  one eighth

If too many trees are cut down in a place, ________.

• A

  a lot of good land will go and much sand will be left
• B

  a lot more farmland will be got
• C

  many more plants will be grown
• D

  more house will be built

China has built the Great Green Wall because ________.

• A

  it does not want to copy the example of the USA
• B

  there is not enough farmland
• C

  many trees are still needed
• D

  the Great Wall is old and broken

The Great Green Wall is made of ________.

• A

  metal
• B

  wood
• C

  trees
• D

  bricks

China built the Great Green Wall to ________.

• A

  meet people's need for more trees
• B

  save the land
• C

  grow a lot more food
• D

  make good use of mountain

Answer 1

序号	参考答案
	C

序号	参考答案
	A

序号	参考答案
	A

序号	参考答案
	C

序号	参考答案
	B