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If you don’t use your arms or your legs for some time, they will become weak; when you start using them again, they will gradually（逐漸地）become stronger again. Everybody knows this. Yet many people do not seem to know that it is the same with our memory.

　　If a friend says that his arms and legs are weak, we know that it is his own fault. But if he tells us that he has a poor memory, many of us think that his parents are to blame（責(zé)怪）, and few of us know that it is just his own fault.

　　Have you ever found that some people can’t read or write but they usually have better memories? This is because they can not read or write and they have to remember things; they can not write them down in a little notebook. They must remember dates, names, songs and stories; so their memories are being exercised the whole time.

　　So if you want a good memory, learn from these people: practice remembering.

1．What will happen to your arms or legs if you don’t use them for some time?

   They will be_________________.

   A．strong          B．broken           C．weak           D．hurt

2．What does the word “fault” mean in the second paragraph?

   A．困難           B．過錯(cuò)            C．粗心            D．聰明

3．What do many of us think of the person with a poor memory?

   A．His parents are to blame.         B．He isn’t clever.

   C．He is foolish.                    D．His parents are very clever.

4．Why do some people usually have better memories but they can’t read or write?

   Because _________________.

   A．they are stronger               B．they often practice remembering things

   C．they have strong arms and legs    D．their parents are good

5．What does the passage mainly（主要） talk about ?

   A．Arms.           B．Legs.          C．Behaviors.        D．Memories.

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（技術(shù)）．We will know better about ourselves．

    We'll find the answer to the genetic code（遺傳密碼）．

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

    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（破壞）less．We'll 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（大腦）．

    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．

1．We can get more information about where we came from by                            ．

A．new technologies                                     B．genetic code

    C．Shenzhou TV                                             D．a(chǎn)stronauts

2．What will be the five scientific achievements in the 21st century?

    a．Finding out where we came from

    b．Taking a picture of the earth

    c．Finding the answer to the genetic code．

    d．Making our lives longer．

    e．Living on the moon and Mars．

    f．Making it clear how our brains work．

    g．Making our planet better．

A．a(chǎn)，b，c，d，g                                         B．a(chǎn)，c，d，e，g

C．a(chǎn)，c，d，f，g                                          D．b，d，e，f，g

3．Many serious illness will become less dangerous because                   ．

A．everybody will be very healthy

B．the genetic code will be known．

C．there will no longer be illnesses

D．people will live longer

4．If a storm（風(fēng)暴）is coming，we may               in the future．

    A．make it less serious                                  B．stop it

    C．make it longer                                            D．clear it away

5．What does the passage mainly（主要地）talk about?

    A．We will know everything about the world．

B．Five scientific achievements are predicted．

    C．All the five things must come true in the 21st century：

    D．We will never die in the next century．