请认真阅读下面短文,从短文后各题所给的 A、B、C、D 四个选项中,选出最佳选项。
Feeling hot? So is the earth. Because of problems like climate change and bad ways of farming, much of the planet's land is drying up. What can we do to solve this problem?
One thing the United Nations did was to create a holiday. In 1994, the UN started World Day to Combat Desertification and Drought(世界防治荒漠化和干旱日), to let more people know about desertification. It is on June 17 every year.
Desertification happens when healthy land—land full of water and nutrients(营养物)—becomes desert, which is dry and unhealthy. Every year, 20,000 to 50,000 square kilometres of the earth's land is lost to desertification. In Africa, scientists predict that two thirds of Africa's healthy land will be lost in the future.
Desertification sometimes happens because of climate change since big and fast changes in temperature can kill plants and trees.
However, it also happens because people use land too much, and in bad ways, to grow food on their farms. Growing too many plants in the same soil, in too short a time, can take away the soil's nutrients faster than the soil can make new ones. That can turn the soil into dry sand, like a desert.
The UN suggests some different actions to stop desertification. One is to teach people better ways of farming, including the use of better fertilizers(肥料). Another is reforestation, which means planting more trees. One country that has done a lot of that is China. China has about 4,000,000 hectares(公顷) of reforested land per year—more than anywhere else in the world.
(
C
) 1. What is the land like if desertification happens?
A. It is full of water.
B. It has more nutrients.
C. It is dry and unhealthy.
D. It is suitable to live on.
(
B
) 2. Why is it bad to grow too many plants in the same soil?
A. Because it changes the climate fast.
B. Because it takes away the soil's nutrients fast.
C. Because it drives away the local animals.
D. Because it takes the place of forests.
(
D
) 3. Which of the following does NOT cause desertification?
A. Climate change.
B. Overusing the land.
C. Using poor fertilizers.
D. Reforestation.
(
C
) 4. What is the last paragraph mainly about?
A. The causes of desertification.
B. The UN's plans for improving farming.
C. The UN's suggestions for fighting desertification.
D. The importance of reforestation.
