请先阅读下面短文，掌握其大意，然后根据短文内容从下面的七个选项中选择五个还原到文中，使短文意思通顺、结构完整，并在答题卡上将其序号涂黑。一空一句。

Do you know the Qinghai-Xizang Railway?【小题1】As the highest railway in the world, it reaches 5,072 meters above the sea level. There are 675 bridges on the railway and 33 passageways (通道) for wild animals to go across the railway safely.

【小题2】Traveling inside Xizang was difficult, too. People often got from one town to another by bus. It took a long time.【小题3】. It starts in Qinghai’s Xining and ends in Lhasa.

“It is a miracle (奇迹) to build a railway above the clouds,” a French newspaper once wrote about the Qinghai-Xizang Railway. The railway runs across no-man’s-land and climbs up snowy mountains. From Qinghai’s Golmud (格尔木) to Lhasa, about 550 km of the railway runs on frozen earth. Over 100,000 workers spent five years building it.【小题4】

Now more and more people visit Xizang.【小题5】The train also takes things from Xizang to the outside world, such as yak (牦牛) meat and butter tea (酥油茶). The Qinghai-Xizang Railway brings people in Xizang a happier and richer life.

A．Before it was built, people got in and out of Xizang with great difficulty.

B．It is necessary to built a railway in China.

C．It is a very important railway in Xizang.

D．So China began to build the railway in 1958.

E．In 2006, the railway was ready.

F．It is difficult for people to travel.

G．People in Xizang get more chances to travel, too.