C．The western part of China.

　　D．Foreign countries.

　　解析：选D　细节理解题。根据第一段提到"Most of the sandstorms that had ... control said on Monday."去年袭击中国的沙尘暴来自外国，故选D项。

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

　　A．Mongolia. B．Africa.

　　C．China. D．Australia.

　　解析：选C　细节理解题。根据第三段"China also suffers from sandstorms ... sand source to northeast Asia"可知中国被认为是东北亚风沙的来源地，故选C项。

　　11．What can we infer from this passage?

　　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.

　　解析：选B　推理判断题。根据第四段提到"The land suffering from ... falling by 1,284 square kilometres a year."遭受风沙袭击的土地每年减少7 585平方公里，沙地的区域每年减少了1 284平方公里，故可知控制沙漠化取得了成效，故选B项。

　　D

　　The more I have thought about what I believe now, the more certain I have become that it is what I have been taught to believe in my boyhood and university.

　　I have been blessed with great teachers. The first and greatest of them were my mother and father. As black people of quite modest means in an often hostile (怀敌意的) environment in Georgia, they suffered a lot because their skins were of such color. Through saving and hard work, they had provided for us children a modest but spotless and attractive home. Neither envy nor hostility of others ever caused them to change their ethical behavior they had established for themselves and their children.

　　The second body of teachers were the idealistic, courageous men and women who had given up better and safer jobs in the North to teach in southern schools like Atlanta University, from which my five sisters, my brother, and I graduated. Both my parents and they were devoted to the principle that compromise is not only evil, but in the long run does not pay.

A second article of faith which I believe in is that love of one's fellow human beings can conquer whatever barriers he faces. In travelling, I have seen again and again what misery and degradation (堕落) of the human spirit hate has brought to mankind. Its damaging effect has been