C. He is probably not very familiar with the person he has called.

　　D. He may need a rest between dialing and speaking.

　　3. People tend to make mistakes when ____.

　　A. they perform several challenging tasks at a time.

　　B. new messages are processed one after another

　　C. their relationships with others are affected

　　D. the tasks require little thought

　　4. What is the main idea of the passage?

　　A. Multitasking has become a way of life.

　　B. Multitasking often leads to efficiency decline.

　　C. Multitasking exercises need to be improved.

　　D. Multitasking enables people to remember things better.

　　B

　　A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃．Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate．Without the forest cover，these areas would reflect more heat into the atmosphere，warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns，potentially causing certain natural disasters all over the world．

　　In the past hundred years，humans have begun destroying rainforests in search of three major resources(资源)：land for crops，wood for paper and other products，land for raising farm animals．This action affects the environment as a whole．For example，a lot of carbon dioxide (二氧化碳)in the air comes from burning the rainforests．People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.

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