The United Nations awarded its highest environmental honors to an environmental project in China，to Shanghai-based Mobike，the world's largest bike-sharing company，and to the chairman of China's largest private green industries enterprise among the six winners of the Champions of the Earth.China's Saihanba Afforestation Community won the honor.
    Saihanba which covers 92，000 hectares（公頃） is a vast forest lying in Chengde，Hebei.In Mongolian，its name means "beautiful highland" and rightly so：across the area，endless forests and grasslands are around the clear lakes.
    Around the 10th century，Saihanba became a royal（皇家的） hunting ground.During the Qing Dynasty，Emperor Kangxi liked Saihanba so much that he made hunting there a royal ceremony.In 1860，the land was opened to the public.In the following years，logging and wildfires destroyed the forest and grassland.By the 1950s，Saihanba had become a poor land，allowing sand to blow into Beijing from the northern deserts.
    Efforts to recreate a national forest in Saihanba started in the 1960s.In 1961，a group of six scientists traveled through Saihanba and studied how to grow trees there.They finally found one tree standing alone in the huge land，which greatly encouraged them.If one tree could grow there，so could millions of others.In 1962，hundreds of foresters began planting trees in the area.Three generations of these foresters have increased forest cover from 11 percent to 80 percent.
    About 56 years later，after overcoming the countless difficulties of planting trees in a very cold place，the poor land is now a huge forest.The forest now supplies 137 million cubic meters（立方米） of clean water each year，while discharging（釋放） 550，000 metric tons of oxygen.Chinese people have created a true wonder in Saihanba over the past half century.

（1）How many winners of the Champions of the Earth come from China？

Three.

Three.

（2）Why is Saihanba called a "beautiful highland"？

It has endless forests，grasslands and the clear lakes.

It has endless forests，grasslands and the clear lakes.

（3）What made Saihanba a poor land by the 1950s？

Logging and wildfires destroyed the forest and grassland.

Logging and wildfires destroyed the forest and grassland.

（4）Who made Saihanba's forest coverage rate reach 80 percent？

Three generations of the foresters.

Three generations of the foresters.

（5）What can Saihanba's forest now supply according to the passage？

It supplies 137 million cubic meters of clean water each year and 550，000 metric tons of oxygen.

It supplies 137 million cubic meters of clean water each year and 550，000 metric tons of oxygen.