题目内容：

    It is reported that a record-breaking high-speed rail will connect Inner Mongolia in the north to Hainan in the south. According to the Shaanxi Development and Reform Commission，the proposed line will operate at a speed of 350 kilometers per hour（217 mph）．

Beginning in Inner Mongolia's Baotou city and running through southern Shaanxi， Hubei， Hunan， Guangxi and Guangdong， its final stop would be in Haikou city on Hainan Island，China's southernmost province．

Though the exact length of the proposed route has not been released，it will likely become the world's longest high-speed rail line as the journey by road between Baotou and Haikou is approximately 3，000 kilometers（1，864 miles） long． Currently， the world's longest high-speed rail line is almost 2，300 kilometers long （1，429 miles）， running from Beijing to Guangzhou．

The proposed rail is part of China's aim to create another "Silk Road of the 21st Century" and improve the country's transportation network while driving land development and urbanization（城市化） in some provincial areas．

Many of the provinces through which the high-speed trains will travel are near major bodies of water，such as the Yellow River in Inner Mongolia and Shaanxi province，the Yangtzi River in Hubei and the South China Sea， where the line would end． It will also take passengers to popular tourist attractions including Zhangjiajie，Xi'an，Guilin and minority areas in western Hunan and Hubei．

"The country is now shifting its focus and investing in the western regions and economically underdeveloped areas，making up for China's long debt to these areas，" Tan yuzhi，professor of the School of Economics and Management at Hubei University for Nationalities， told local media． " The project will significantly narrow regional disparities（差异） and solve minority issues．"

However，Deng Hongbing，director of China University of Geosciences' Center for Regional Economic and Investment Center，said that if the north-to-south railway is to go ahead，there needs to be a sound ecological program in place to ensure the protection of these underdeveloped and ecologically sensitive areas．

1.What is the passage mainly talking about？ ______

A.China has decided to invest in the western areas．

B.Another high-speed train line is being planned．

C.The train will speed up to 350 kilometers per hour．

D.China has produced the best high-speed train line．

2.How many provinces will the proposed line cross？ ______.

A.9 B.8

C.7 D.6

3.Once the high-speed rain line is built，______ ．

A.It will be the most convenient high-speed rail line in China

B.It will benefit the underdeveloped areas a lot in the west

C.It will transport goods faster from north to south

D.It will do good to the environment alongside the line

4.What is Tan Yuzhi's attitude towards the proposed project？ ______.

A.Ironical B.Doubtful

C.Puzzled D.Supportive