We must plant more trees to stop the sand from ________ towards the rich farmland．

1. A.
   move
2. B.
   to move
3. C.
   moved
4. D.
   moving

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.
根據短文內容，選擇正確答案。
【小題1】The Great Green Wall in China is ______.

①Forests help to keep water from running away, so drought does not often happen. The trees in the forests can keep raindrops from hitting the soil directly, and the dead leaves on the ground can also keep the water from running away.②
Chinese people don’t want to see more floods and droughts. We have built the “ Great Green Wall” of trees across the northern part of our country.③ Thanks to the “ Great Green Wall”, we can prevent the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland. That’s why more “ Great Green Walls” are needed. Trees must be planted all over the world.④
根據短文內容，從題中所給的A、B、C、D四個選項中，選擇最佳答案。（10分）
【小題1】 “Great Green Wall will make the world better.” This sentence should be put in      .

①Forests help to keep water from running away, so drought does not often happen. The trees in the forests can keep raindrops from hitting the soil directly, and the dead leaves on the ground can also keep the water from running away.②

Chinese people don’t want to see more floods and droughts. We have built the “ Great Green Wall” of trees across the northern part of our country.③ Thanks to the “ Great Green Wall”, we can prevent the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland. That’s why more “ Great Green Walls” are needed. Trees must be planted all over the world.④

根據短文內容，從題中所給的A、B、C、D四個選項中，選擇最佳答案。（10分）

1. “Great Green Wall will make the world better.” This sentence should be put in      .

2.       can help to keep water from running away.

3. The reason of building “ Great Green Wall”is        .

4. We have built the “ Great Green Wall” of trees        of China.

5.From the passage, we can know which is wrong.