5.What is the main idea of this passage?

A.Everyone has his or her own ambition.

    B.Harry can't decide what he wants to do.

    C.Ambitions ate about success at work.

    D.Somebody doesn't have a ambition.

B

    It is predicted that there will be five scientific achievements in the 21st century.

    We'll know where came from.

    We'll know where humans came from.We can get more information about this by using new technologies(技术).We will know better about ourselves.

    We'll find the answer to the genetic code(遗传密码).

    Scientists will learn more about the genetic code and how our bodies work Many serious illness will he less dangerous because there wilt be a cure(疗法).

    We'll live longer.

    People will live longer because people won't get serious illness.New medicine will keep us strong and healthy.Maybe we will live to be 120 years old,but what shall we do with such a long time?

    We'll “manage” the earth.

    In the next hundred years,we'll stop talking about the weather but to do something to make the damage(破坏)less.We'11 know what human activities can bring to the earth,and with that knowledge we will make our planet(行星)better.

    We'll have a map of the brain(大脑).

    We will try to make a map of the brain.We’ll be able to say which part is working

 when we read a word,say a word,or think about a word,and so on.

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