There are two main reasons for this．Firstly，when people cut down trees，generally they can only use the land for a year or two．Secondly，cutting large sections of rainforests may provide a good supply of wood right now，but in the long run it actually reduces the world’s wood supply．

　　Rainforests are often called the world’s drug store．More than 25％ of the medicines we use today come from plants in rainforests．However，fewer than l％of rainforest plants have been examined for their medical value．It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests．

　　5．Rainforests can help to adjust the climate because they

　　．

　　A．reflect more heat into the atmosphere

　　B．bring about high rainfall throughout the world

　　C．rarely cause the temperature to drop lower than l6℃

　　D．reduce the effect of heat from the sun on the earth

　　6．What does the word “this” underlined in the third paragraph refer to?

　　A．We will lose much more than we can gain．

　　B．Humans have begun destroying rainforests．

　　C．People have a strong desire for resources．

　　D．Much carbon dioxide comes from burning rainforests．

　　7．It can be inferred from the text that

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