【答案与解析】本文讲述的是沙漠的自然环境和沙漠人的生活情况。(from www.nmet168.com)

1. C。推理判断题。根据第1段第1、2句The deserts of the world are not all covered with sand. Many of them have surfaces of rock or clay or small stones(世界上的沙漠并非全都覆盖着沙。许多沙漠表面有岩石、泥土或小石子)可推知沙漠主要是由沙组成的。故答案为C。

2. D。推理判断题。推断词义。根据文章最后一句No man in the desert would ever refuse to give a stranger food and water由沙漠里没有人会拒绝给一个陌生人饭和水，可推断他们是很友好的(hospitable)，故答案为D。

3. C。推理判断题。根据第1段最后一句There is little rain in the desert, but it does fall often enough for most plants可知沙漠有少量降水，但并不充足。故答案为C。

4. C。推理判断题。根据第2段第2句People also live outside oases(绿洲)和第3段中they trade their skins and their goats and camel hairs with the people of oases for wheat and fruit 可知人们有住在绿洲内的，也有住在绿洲外的。故答案为C。

5. A。推理判断题。根据第3段The people of the desert have to move constantly from place to place可知沙漠人住得不稳定；They usually live in tents住得不舒服；When there is no more food for their animals食物不充足。由此可推断沙漠生活的艰难。故答案为A。

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