Scientists have had some success turning this wasteland into useful farmland. Today the desert is dotted with huge wheat fields watered by a system of pipes that carry water from the underground tanks. Farmers have also learnt that plants grow better if seeds are planted next to stones. Studies show that stones provide protection from the sun, allowing seeds to grow in a shady and cool environment. In addition to that, greenhouses have been built to protect plants from the sunshine so that less water is needed. Another idea is to grow plants that can live on a diet of salt water, since the ocean is so near to the desert.

　　1. What will probably happen if the local people continue their customs and traditions?

　　A. The desert will continue to be enlarged.

　　B. Tourists will begin traveling to North Africa.

　　C. More oases will begin to appear across the desert.

　　D. The number of healthy animals will become larger.

　　答案解析：答案为A。本题为推理题。结合前三段可知，撒哈拉沙漠原本是绿洲，后由于人类过度放牧（overgrazing）、滥砍乱伐（these people cut down whatever trees they could find ）导致了沙漠的形成和扩大，因此可以推断，如果当地人继续沿袭他们的老传统，会导致沙漠继续扩大。故答案为A。

　　2. Which of the flowing statements is a fact presented in the passage?

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