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(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 help free radicals to attack plants.

D.Antioxidants can protect plants from ultraviolet light.

2.In which order do the following facts occur?

a .Wrinkled skin can be seen

b .Ultraviolet light causes free radicals to form

c .Free radicals damage cells in our bodies

d .The sun gives out ultraviolet light

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

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

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

A.our defences get weaker as we get older

B.our bodies’ defences are not natural

C.we are too young to defend ourselves

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

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

A.Ultraviolet light from the sun

B.Colorful food

C.Polluted air

D.The body itself

A schoolgirl saved her father’s life by kicking him in the chest after he suffered a serious allergic(过敏的) reaction(反应) which stopped his heart .

Izzy , nine ,restarted father Colm’s heart by stamping(踩)on his chest after he fell down at home and stopped breathing .

Izzy’s mother, Debbie, immediately called 999 but Izzy knew doctors would never arrive in time to save her father, so decided to use CPR .

However, she quickly discovered her arms weren’t strong enough, so she stamped on her father’s chest instead.

Debbie then took over with some more conventional chest compressions(按压) until the ambulance arrived .

Izzy, who has been given a bravery award by her school, said:“I just kicked him really hard ,My mum taught me CPR but I knew I wasn’t strong enough to use hands .I was quite scared .The doctor said I might as well be a doctor or a nurse, My mum said that Dad was going to hospital with a big footprint on his chest .”

“She’s a little star,” said Debbie, “I was really upset but Izzy just took over . I just can’t believe what she did. I really think all children should be taught first aid. Izzy did CPR then the doctor turned up, Colm had to have more treatment on the way to the hospital and we’ve got to see an expert.”

Truck driver Clom, 35, suffered a mystery allergic reaction on Saturday and was taken to hospital, but was sent home only for it to happen again the next day. The second attack was so serious that his airway swelled, preventing him from breathing, his blood pressure dropped suddenly, and his heart stopped for a moment.

He has now made a full recovery from his suffering.

1.Izzy kicked her father in the chest_________.

A. to express her helplessness B. to try CPR on him

C. to keep him awake D. to restart his heart

2.What’s the right order of the events?

① Izzy kicked Colm

② Debbie called 999

③ Izzy learned CPR

④ Colm’s heart stopped.

A. ③①②④ B.④②③① C. ③④②① D. ④③①②

3.What does Paragraph 8 mainly talk about?

A. What Colm suffered.

B. Colm's present condition.

C. What caused Colm's allergy.

D. Symptoms of Colm's allergic reaction.

A group of people from Denmark have formed the B-Society. According to them, human beings are divided into types: A-People, and B-People. A-People have no problem getting up in the morning, and operate much better earlier in the day. However, B-people are better later in the day. “I’m useless early in the morning,” says one of the members of the B-Society.”All I can do is drink coffee, and stare into space. People used to get up early because they had to feed the animals. But I haven’t got any cows or chickens, so I can sleep late,” She adds. Since the society was set up, the B-Society has welcomed several thousand members.

Right now, the B-Society is fighting hard for businesses to join its B-certification (证明) list. Companies that are “B-certified” basically give their employees the opportunity to come in when they want. In some companies, employees arrive at any time up to 3:30 pm --- each to their own rhythm (节奏).

And it is not just businesses that are benefiting from this. Teenagers who can’t get out of bed in the morning, and parents who never quite get the kids to school on time, can now benefit from B-classes. From next year, a school in Copenhagen will offer classes which start later in the day (at 10 instead of eight). And even the government seems to like the idea.

The B-Society was founded by Camilla Kring, a professor from the University of Copenhagen. On her website, she says, “When B-people’s work rhythms are considered at the work place, their productivity (生产力) and quality of life is increased, which can increase productivity for the entire organization.”

She adds that, “B-Society will create a new daily rhythm in schools and other institutions (机构) as an alternative to the current rhythm of ‘early at work and early at home’. We are working for the establishment of kindergartens, primary and secondary schools as well as universities that open between 10 am and 8 pm.”

Would you like to work for a B-certified company?

1. According to the text, who belong to the B-Society?

A. Late risers. B. Businessmen.

C. Animal lovers. D. Sleep experts.

2. In B-certified companies, employees can ____.

A. get more working opportunities

B. join any other companies

C. work on any days they choose

D. go to work at any time of a day

3.In Camilla Kring’s opinion, B-people _______.

A. are more hard-working than A-people

B. have a better quality of life than A-people

C. are more productive if given more freedom

D. like the rhythm of “early at work, early at home”

4.The author’s purpose in writing this text is to _____.

A. stress the importance of getting up early

B. express his attitude towards the B-Society

C. introduce a group having a special daily rhythm

D. call on people to work for B-certified companies

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