Most schools ban chewing gum，but in a few years they might consider changing that rule．Why？ Scientists are finding evidence that gum chewing may be good for your health．It may even help boost（提高）your test scores．

This exciting research is just beginning．And in the meantime，companies are also experimenting with adding vitamins，minerals，medicines，and other substances that could give gum the power to cure headaches and fight everything from serious diseases to bad breath．

People have been chewing gum for thousands of years．Ancient Greeks，Mayas，and Native Americans，for example，chewed on the sap，or resin of certain types of trees．Today gum is a litde more complicated．Gum manufacturers start by mixing resin，wax，and a molecule called polyvinyl acetate to make a gum base．By varying the types and amounts of these ingredients，scientists can make thousands of formulations．

Just what can gum do for your health？Many studies show that chewing gum after meals fights cavities（洞）by stimulating the production of saliva．Saliva helps wash away bacteria that damage our teeth．An ingredient called xylitol，which is added to it，provides an extra dose of cavity－fighting power．This is good for more than just the teeth．Research suggests that good oral health decreases the risk of heart disease，and other serious diseases．

Chewing gum might also be good for your brain．Chewing gum boosts the flow of blood to participants’brains by 40 percent．

But too much chewing can damage the jaw joint．And chewing too much of gum that contains vitamins，caffeine，or a medicine could lead to an overdose．What’s a more，no matter how healthy gum chewing proves to be，it will never be a match for a healthy lifestyle．

Nothing like gum or a vitamin is going to cure a bad dietary habit or a bad exercise habit；it’s not a magic bullet．

64．Why are companies trying to put medicines into gum？

A．Because they want gum to cure some diseases．

B．Because they wish people to become addictive to it．

C．Because they plan to make gum more tasteful．

D．Because they hope to make gum good for teeth．

65．From the last two paragraphs，we can infer that      ．

A．chewing gum has a magic power to cure your bad lifestyle

B．chewing gum can’t  replace the healthy lifestyle

C．chewing gum can lead to a bad exercise habit

D．too much gum chewing proves to be harmful to your teeth

66．How does chewing gum fight cavities？

A．By making people brush teeth immediately after meals．

B．By killing bacteria that are harmful to our teeth．

C．By making people produce more saliva．

D．By adding some more medicines to the gum．

67．The best title for the passage may be      ．

A．A Match for Exercise                                  B．Gum Chewing is a Magic Bullet

C．No Gum Chewing at School                        D．Chewing Gum for Health

Dear World,

     My son starts school today. It's going to be strange and new to him   1   . And I wish you would treat him    2   . You see, up to now, he's been king of the roost. He's been boss of the backyard. I have always been around to   3    his wounds, and to soothe his feelings.

     But now, things are going to be   4   . This morning, he's going to walk down the front steps, wave his hand and start on his great    5   that will probably includes wars and tragedy and sorrow. To live his life in the world, he needs faith and love and   6   .

     So, World, I wish you would take him by his young hand and teach him the things he will have to know. Teach him, but gently, if you can. Teach him that for every scoundrel (恶棍) there is a hero, that for every dishonest politician there is a dedicated     7  ; that for every enemy there is a friend. Teach him it is far more honorable to fail than to cheat. Teach him to have faith in his own ideas, even if everyone else tells him they are   8   .Teach him to sell his strengths and brains to the highest bidder (出价人), but never to put up a price on his heart and     9   .

     Teach him gently, World, but don't   10   him, because only the test of fire makes fine steel.

     This is a big order, World, but see what you can do. He's such a nice little fellow.

1．A．at the moment        B．after a while     C．in a while         D．for a while

2．A．happily             B．gently           C．honestly          D．fairly

3．A．relieve             B．release         C．repair             D．decrease

4．A．strange            B．different        C．hopeful           D．difficult

5．A．journey               B．outing          C．adventure          D．tour

6．A．health                 B．courage         C．truth              D．heart

7．A．people               B．God            C．president           D．leader

8．A．right                 B．honest          C．wrong            D．stupid

9．A．mind                  B．soul             C．body            D．brain

10．A．spoil             B．rain             C．encourage          D．scold

完形填空（共20小题；每小题1分，满分20分）

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

I work as a volunteer for an organization that helps the poor in Haiti. Recently I took my son Barrett there for a week, hoping to___1____ him.

Before setting out, I told Barrett this trip would be tiring and ____2____. For the first two days, he said almost nothing. I worried the trip was too ___3____ for a 17-year-old. Then, on day three, as we were ___4____ over high rocky mountains, he turned to me and grinned(咧嘴笑),“Pretty hard.”

After that there was no turning back. A five-year-old girl, wearing a dress several sizes ___5___ large and broken shoes, followed Barrett around, mesmerized(着迷). He couldn’t stop ___6____. Later he said ____7____ , “I wish I could speak French.” I was ___8___— this from a boy who hated and ___9____ French classes throughout school.

Usually silent, he ___10___ Gaby, our host, and kept asking questions about the country and its people. He blossomed(活泼起来).

__11___, the moment that really took __12___ breath away occurred in a village deep in the mountains. I was ___13___ a woman villager for an article. 135 centimeters tall, she was small in figure but strong in ___14___. Through determination, she had learned to read and write, and __15___ to become part of the leadership of the __16___.

　　Learning her story, Barrett was as ___17___ as I by this tiny woman’s achievements. His eyes were wet and there was a ___18___ of love and respect on his face. He had finally understood the importance of my work.

　　When leaving for home, Barrett even offered to stay ___19___ as a volunteer. My insides suddenly felt struck. This ___20____ achieved all I’d expected. Soon he will celebrate his 18th birthday. He’ll be a man.

1.                A．comfort        B．please          C．attract    D．educate

2.                A．rough          B．dangerous       C．troublesome   D．violent

3.                A．little           B．much          C．fast  D．slow

4.                A．moving         B．running         C．climbing  D．looking

5.                A．too            B．very           C．even D．so

6.                A．joking          B．crying          C．shouting  D．smiling

7.                A．patiently        B．regretfully       C．lightly    D．cheerfully

8.                A．ashamed        B．disappointed     C．determined   D．surprised

9.                A．took up         B．went in for      C．fought against  D．called off

10.               A．befriended      B．disregarded     C．avoided   D．recognized

11.               A．Thus           B．Even           C．Meanwhile D．However

12.               A．my            B．his            C．our   D．her

13.               A．asking          B．interviewing     C．arranging  D．describing

14.               A．brain          B．wish           C．will   D．health

15.               A．appeared       B．struggled       C．hesitated  D．failed

16.               A．village         B．city            C．organization    D．state

17.               A．pleased        B．bored          C．puzzled   D．touched

18.               A．combination     B．composition     C．connection D．satisfaction

19.               A．in             B．behind         C．out   D．away

20.               A．interview       B．flight           C．article D．trip

Some people think that they will get ill if they use their brains（大脑）too much.  It is not true.  Through many researches, scientists show us that the more you use your brains, the better they will be, and the wiser you will become.

Of course, if you want to keep your mind clear and be energetic（充满活力的）, you must take a proper rest and study properly.  To the teenagers, using their brains in the morning is good for their health.

There are many ways to rest.  One is a peaceful rest.  Sleep is a peaceful rest.  Another is an active rest.  For example, take a walk outdoors, do morning exercises every day.  To change the way of the brains’activities（活动）is also a good way to rest.

In everyday life, to eat some eggs, meat, fresh vegetable and fruit is also good for the brains.

Wish you a wise man and a happy life.

1.If ________________ ,your mind will be clean?

2.Which of the following statements is false?

3.Which of the following is true according to the passage?

4.Which of the following can be used as the best title of the passage?