4. Which of the following is the best summary of this passage?
A. Drilling machines help to water the desert floor and make plants and animals alive.
B.Scientists have been able to turn this large wasteland into a successful farming community.
C. So much soil has become sand that the desert will never be able to support life as it once did.
D. The desert no longer supports plenty of life, but researchers hope to change it with new scientific techniques.
答案解析:答案为D。本题为主旨大意题。本文揭示了撒哈拉沙漠形成的原因,重点是介绍科学家依靠科学技术试图让这片沙漠变成绿洲的方法。故答案为D。
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