[单项选择]Since the earliest times, trees have always been very useful and important to man who made use of them in numerous (众多的) ways for his daily life. Even today trees continue to serve man in so many useful ways.
Trees provide man with food, fuel for burning and building material in the form of wood. Without trees it would be impossible to build houses, boats and even bridges. Furniture such as tables, chairs and cupboards are also made from wood.
In the tropics (热带) where it is very warm throughout the year, trees protect man from the fierce heat of the sun. They are useful in preventing good and fertile top soil from being washed away during heavy rains which are so common in the tropics.
If there are no trees or vegetation (植物) of some sort to hold back the soil with their roots, heavy rains would wash away the rich surface soil so essential for agriculture. The result is that the land becomes useless and unproductive.
There are many desert areas in the world. A long
A. the land would become fertile
B. heavy rains would clean the tropics
C. the rich top soil couldn’t be held
D. there would be no agriculture

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