| 阅读理解。 |
| Since the earliest times, trees have always been very useful and important to man who made use of them in many ways. Even today trees continue to serve man in many ways. Trees provide man with fruits and building materials in the form of wood. Without trees it would be impossible to build houses, boats and even bridges. Furniture such as tables, chairs and beds is made of wood. In the tropics (热带地区) where it is very hot all through the year, trees protect man from the terrible heat. They are also useful.in preventing good and rich top soil from being washed away during heavy rains which are so common in the tropics. If there were no trees or vegetation (植被) of some kinds to hold back the soil with their roots, heavy rains would wash away the rich surface soil that is so important and necessary to agriculture. The result is that the land becomes a desert. There are so many desert areas in the world. A long time ago these desert areas must have been very rich fertile (肥沃的) areas, but since our ancestors (祖先) in the distant past had no enough knowledge about science of nature, they cut down all the trees in the areas where they lived and never planted new ones. By and by, the rich surface soil was blown away and washed away by strong wind and heavy rain. In the end the land was turned into useless deserts where nothing could grow. |
| 1. Trees provide ______ in the form of wood |
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| A. man with houses B. man with fruits and building materials C. people with bridges D. people with boats |
| 2. ______ are made of wood. |
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| A. Building materials B. Old houses C. Chairs and beds D. New fruits |
| 3. Trees protect man from ______ in the tropics. |
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| A. heavy rain B. good and rich top soil C. being washed away D. the terrible heat |
| 4. If there were no trees or vegetation to hold back the soil with their roots, ______. |
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| A. the land would be richer B. many plants could grow C. heavy rains would wash away the rich surface soil D. the land would not be turned into useless deserts |
| 5. Because trees were cut down, ______. |
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| A. the soil became richer B. the land was turned into useless deserts C. new trees were planted on the land D. the land was washed away by strong winds |