Nature is full of color, from rainbows and roses to butterfly wings and peacock tails. Even the fruits and vegetables you eat have different colors: blue blueberries, red strawberries, green broccoli, and orange carrots.
Plant and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemical called antioxidants(抗氧化物). Plants make antioxidant to protect themselves from the sun’s ultraviolet(UV)(紫外线)light.
Ultraviolet light causes chemicals called free radicals(自由基)to form within plant cells. They can destroy parts of plant. Free radicals also have damaging effects on human beings. Some of these effects like wrinkled skin can be seen. The damage is caused by the free radicals attacking cells in our bodies. Certain cancers and heart disease are linked to free radicals.
Our bodies have natural defences for fighting off free radicals. While we are young, our defences are pretty strong. However, they get weaker as we get older. The body’s built-in defences can only go so far without extra help.
The key to fighting free radicals with fruits and vegetables is to mix and match colors. It’s like sunscreen(防晒霜)for the inside of your body. Go for a range of very bright colors. Colorful foods contain hundreds of healthy chemicals not found anywhere else.
Research into how chemicals in blueberries affect the brain’s function in rats suggests that these chemicals may help our own brains work more efficiently.
Don’t just blame the sun. Ultraviolet light isn’t the only source of free radicals. If you breathe polluted air such as smog, automobile exhaust(废气), or wasted gas from a factory, you take in chemicals that also cause such damage. And, the body itself produces free radicals as it processes food.
【小题1】Which of the following not true?

Nature is full of color, from rainbows and roses to butterfly wings and peacock tails. Even the fruits and vegetables you eat have different colors: blue blueberries, red strawberries, green broccoli, and orange carrots.

Plant and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemical called antioxidants(抗氧化物). Plants make antioxidant to protect themselves from the sun’s ultraviolet(UV)(紫外线)light.

Ultraviolet light causes chemicals called free radicals(自由基)to form within plant cells. They can destroy parts of plant. Free radicals also have damaging effects on human beings. Some of these effects like wrinkled skin can be seen. The damage is caused by the free radicals attacking cells in our bodies. Certain cancers and heart disease are linked to free radicals.

Our bodies have natural defences for fighting off free radicals. While we are young, our defences are pretty strong. However, they get weaker as we get older. The body’s built-in defences can only go so far without extra help.

The key to fighting free radicals with fruits and vegetables is to mix and match colors. It’s like sunscreen(防晒霜)for the inside of your body. Go for a range of very bright colors. Colorful foods contain hundreds of healthy chemicals not found anywhere else.

Research into how chemicals in blueberries affect the brain’s function in rats suggests that these chemicals may help our own brains work more efficiently.

Don’t just blame the sun. Ultraviolet light isn’t the only source of free radicals. If you breathe polluted air such as smog, automobile exhaust(废气), or wasted gas from a factory, you take in chemicals that also cause such damage. And, the body itself produces free radicals as it processes food.

1.Which of the following not true?

A．Antioxidants are responsible for plant colors

B．Plants use color to attract attention

C．Antioxidants can protect plants from UV light

D．Antioxidants help free radicals to attack plants

2.In which order do the following facts occur?

a Wrinkled skin can be seen

b UV light causes free radicals to form

c Free radicals damage cells in our bodies

d The sun gives out UV light

A．a,b,c,d                                B．d,b,c,a

C．c,a,d,b                                D．d,b,a,c

3.We need extra help for fighting off free radicals from fruits and vegetables because ____.

A．our bodies’ defences are not natural

B．we are too young to defend ourselves

C．our defences get weaker as we get older

D．our bodies’ built-in defences can only go away

4.Which of the following can not cause free radicals to form?

A．Colorful food                          B．UV light from the sun

C．Polluted air                            D．The body itself

Abbie, shy and quiet, started her ninth grade in a new school. She soon found herself  1   her old class. This new school was much too cold and  2   !

       No one at this school seemed to  3   if Abbie felt welcome or not. She walked the halls every day almost invisible; her  4   was never heard.

       Her parents were very worried about her and they knew since they got divorced（离婚）,she probably needed a  5   very badly. They tried everything they  6   to help her fit in. They bought her clothes and CDs, but it didn’t  7  .

       Believing that no one would ever become her real friend, Abbie often  8  herself to sleep. She was all alone with  9   to do but let her mind run  10   .

       She once tried  11   a Christian youth group at a local church, hoping to make friends but her   12   failed her again. Abbie was so upset that she was thinking of ending her life. She decided that she would jump  13   the local bridge on Christmas Eve, while her parents were at a party.

         14   she left her warm house for the bridge, she decided to leave her parents a note in the mailbox. When she opened the mailbox, she found some letters already there.

       She  15   the letters out and found one addressed to her. It was a card from one of the guys in the youth group:

       Dear Abbie,

       I want to apologize for not talking with you   16   You know, my parents are in the middle of a divorce, so I am hoping you could help me with some questions I have about divorced kids. I think we could become friends. See you at Youth Group on Sunday!

                                                                             Sincerely your friend, Wesley Hill

       She  17   at the card and read it over and over again. “Become friends,” she smiled,  18 that someone cared about her life and wanted her as a friend. She felt so special.

       She called Wesley. I guess you could say he was  19   Christmas miracle（奇迹）because

  20   is the best gift you can give anyone.

1．A．missing                 B．enjoying              C．impressing           D．reminding

2．A．cruel                     B．lonely                  C．painful                D．unfriendly

4．A．sound                   B．whisper               C．noise                   D．voice

5．A．relative                  B．friend                  C．roommate            D．brother

6．A．should                  B．would                 C．could                  D．might

7．A．affect                   B．match                 C．work                  D．attract

8．A．screamed              B．cried                   C．waited                 D．fought

9．A．everything             B．anything              C．nothing               D．something

10．A．sad                     B．calm                   C．excited                D．wild

11．A．joining                 B．forming               C．creating               D．inserting

12．A．pride                   B．shyness               C．guilt                    D．shame

13．A．beyond                B．across                 C．off                      D．into

14．A．Though               B．Unless                 C．Since                  D．As

15．A．opened                B．pulled                  C．read                    D．tore

16．A．faster                  B．sooner                 C．quicker               D．longer

17．A．glanced               B．stared                  C．pointed                D．worked

18．A．realizing              B．judging                C．meaning              D．guessing

19．A．the                      B．a                         C．this                     D．that

20．A．friendship      B．satisfaction        C．security            D．marriage