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.

　　【参考答案】29.1-4 ABAB

　　阅读理解。请认真阅读下列短文,从短文后所给的A、B、C、D四个选项中,选出最佳选项。      

　　  has killed more than 150 people in Uganda.

　　The Ebola virus kills so quickly that the body’s defense system has no time to act against it. The disease kills fifty to ninety percent of the people it infects (感染). The disease begins with high body temperature, severe headache and muscle hurting. Then it causes severe bleeding and organ failure. Then the victim dies. Doctors say a person with the Ebola virus usually dies within three weeks after becoming infected. The disease spreads by people touching the body fluids of an infected person.

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