题目内容：

    Do you know anyone who plays Ant Forest? It is a game on Alipay. Users collect “energy “ for their “trees” to grow. When their “tree” finishes growing, Alipay will plant a real tree in the desert areas of China.

This is part of China’s efforts to fight desertification . Since 1978, China has planted over 66 billion trees across its dry northern areas, according to China Daily.

Desertification means there are no trees or grass. Water can’t stay in the soil and sand is everywhere.

About 2.6 million square kilometers of China’s land is covered with sand. That’s about 27 percent of the country’s land. It has also caused sandstorms .

By planting new trees, sandstorms in China have been cut by 20 percent in recent years. About 13,000 square kilometers of land have become oases (绿洲).

Ian Teh, a British photographer , traveled through northern China last year. He saw many new oases.

“It was hard to imagine that it was ever a desert,” he told Wired magazine.

1.What is Ant Forest?

A.It is an app that lets people buy things.

B.It is a game that can help fight desertification.

C.It is a forest for people to grow trees in.

D.It is a name for a group of special ants.

2.What has China done to fight desertification in the past 40 years?

A.Planted billions of trees. B.Built houses in dry northern areas.

C.Moved all the sand to one place. D.Built oases around cities.

3.Planting new trees has helped China cut down sandstorms by    .

A.2.6 percent B.27 percent C.20 percent D.66 percent

4.How did Ian Teh like northern China after his visit last year?

A.It was hard to travel in the desert. B.It was amazing to see new oases there.

C.It was still full of sand. D.It was not easy to find any trees in the north.