2．Where do most of the sandstorms in China come from?

　　A．The northern Chinese regions.

　　B．The northwestern Chinese regions.

　　C．Foreign countries.

　　D．The western part of China.

　　【解析】　细节理解题。根据第一段第一句Most of the sandstorms that had swept China last year originated from foreign land和第二段的a dozen came from foreign land可知，中国遭受沙尘暴侵袭的沙尘大部分来源于国外。

　　【答案】　C

　　3．Which of the following is believed to be the sand source to northeast Asia?

　　A．China.

　　B．Africa.

　　C．Mongolia.

　　D．Australia.

　　【解析】　细节理解题。根据第三段第一句．..China also suffers from sandstorms from outside the country while being blamed as a sand source to northeast Asia.可知，中国被认为是东北亚风沙的来源地。

　　【答案】　A

　　4．From the passage，we can infer that ________.

　　A．the land in China suffering from desertification has been increasing greatly

　　B．China has made achievements in its own desertification control

　　C．the desertification land makes up nearly half of China's territory

　　D．little progress has been made in controlling desertification in China

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