A. The desert is rich in beautiful color and scenery.

　　B. Camels can go for days without drinking any water.

　　C. The Sahara will one day become a beautiful garden.

　　D. Large river systems once supported many communities.

　　答案解析：答案为D。本题为推理题。考生需看清题意，要求选择与原文符合的事实。由第二段最后一句话 “At that time, huge river systems and many oases supported growing communities where a large number of people lived.”可知，答案为D。

　　由第一段 “Except for an occasional oasis, this vast land is mainly made up of sand, stones, and worn out mountains.”可知，A选项错误；B选项未提及；C选项也不是事实。故答案为D。

　　3. The author of the passage provides evidences (证据)that scientists are

　　.

　　A. pleased by the progress but do not have the money to continue

　　B. discouraged by the poor results of their experiments

　　C. hopeful about the chances of life coming back to the desert

　　D. troubled by the lack of water found underground

　　答案解析：答案为C。本题为推理题。由最后两段可知，科学家一直在研究让沙漠变绿洲的办法，并且已经付诸实践，取得了一定的成效，故可推断，科学家满怀希望想使撒哈拉沙漠恢复生机。故答案为C。

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