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 (类黄酮)—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.

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

　　A．Benefits from black tea

　　B．Different kinds of tea

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