A．the English prefer to make long speeches

　　B．too many words are of no use

　　C．people from Thailand are quiet and shy by nature

　　D．even talk and silence can be culturally different

　　．According to the text, how can people from different cultures understand each other better?

　　A．By sharing different ways of life.

　　B．By accepting different habits.

　　C．By recognizing different values.

　　D．By speaking each other' s languages.

　　．What would be the best title for the text?

　　A．Multicultural Environment.

　　B．Cross-Cultural Differences.

　　C．How to Understand Each Other.

　　D．How to Build Up a Relationship.American researchers say drinking tea may help strengthen the body’s defense system against infection（感染）. Doctors at Brigham and Women’s Hospital in Boston, Massachusetts, did the study. The team studied a chemical found in black, green, oolong and pekoe tea. This chemical is an amino acid（氨基酸）called L-theanine. The scientists say it may increase the strength of gamma delta T cells. That’s the letter T, not the drink. Gamma delta T cells are part of the body’s defenses.

　　First, the researchers mixed some of these cells with antigens（抗原）found in the amino acid. Antigens help the body react to infection. Then the scientists added some bacteria（细菌）. Within twenty-four hours, the cells produced a lot of interferon, a substance that fights infection. Cells not mixed with the antigens did not produce interferon.

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