The corridor once connected China's central plains with the grasslands in the Xinjiang Uygur Autonomous Region and separated the Tengger and Badain Jaran Deserts.

　　“Building dams was one of the reasons Minqin has been devastated，”Wang said. Residents also dug up more than 10,000 wells，exacerbating the situation.

　　52．The desert is expanding because of________.

　　A．less water in the Shule River

　　B．damming on the river

　　C．increased agriculture

　　D．all the above

　　答案　D　[由“The desert is expanding because there is less water in the Shule River to its east.Increased agriculture in the Dunhuang oasis and damming on the river since the 1960s has dried up the area，Wang said.”可知。]

　　53．The Mogao Grottoes are famous for the following except____________.

　　A．statuesB．its location

　　C．wall paintingsD．Buddhist art

　　答案　B　[由“Its caves are famous for their statues，wall paintings and 1,000 years of Buddhist art.”可知。]

　　54．From the text，we can see that________.

　　A．the Hexi Corridor was not an oasis

　　B．the Kumutage Desert once expanded from 1 to 4 m every year

　　C．the Mogao Grottoes may be located east of the Shule River

　　D．digging up wells helped improve devastation

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