Afewcupsofgreenteaeachdaymayhelppreventheartdisease,Gre...

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A few cups of green tea each day may help prevent heart disease, Greek researchers said on Wednesday. A study published in the European Journal of Cardiovascular (心血管的) Prevention showed further evidence of the potential health benefits from tea already linked to a reduced risk of a range of cancers and other conditions.

The study showed that green tea improves blood flow and the ability of arteries (动脉) to relax, said Charalambos Vlachopoulos, an expert at the Athens Medical School in Greece who worked on the study.

Other studies have shown that black tea also has benefits for cardiovascular health.

The Greek team said they believed green tea might be even better because it had higher quantities of beneficial substances called flavonoids (类黄*)-some of which are lost in the oxidation (氧化) process that black tea undergoes.

Flavonoids are also found in cocoa, tomatoes and grapes. "A couple of cups a day would probably be good for people," Vlachopoulos said. "This is the first study to show these effects for green tea."

The researchers gave 14 healthy volunteers either green tea, coffee or hot water and then measured the function of endothelial cells (内皮细胞)．These cells help relax arteries and ease blood flow. "What is important is these effects are evident within 30 minutes, "Vlachopoulos said.

The measurements taken 30, 90 and 120 minutes following consumption showed an almost immediate benefit among people who had drunk green tea, he said. While the researchers looked only at a short-term effect, Vlachopoulos said the team's studies suggest the protection is long-lasting.

"Green tea is consumed less in the Western world than black tea, but it could be more beneficial," he said.

25．What would be the best title for the passage?

A．Benefits from Black Tea             

B．Different Kinds of Tea

C．Green Tea Protects Against Heart Disease

D．Green Tea Reduces the Risk of Cancer

26．According to the study, green tea can do the following EXCEPT________.

A．improve blood flow                   B．benefit cardiovascular health

C．help relax arteries                  D．increase the oxidation rate of flavonoids

27．Which of the following statements is TRUE?

A．Green tea is better than black tea because it has been processed. B．Green tea contains more flavonoids than black tea. C．Vlachopoulos's study is based on many years' research. D．Vlachopoulos's study shows the effects of Green tea are not evident in short time.

28．We can learn from the passage that________.

A．14 volunteers with heart disease joined in the experiment B．it takes an hour for green tea to take effect C．green tea has a long－lasting effect according to Vlachopoulos D．Westerners prefer green tea to black tea

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