“The team studied a chemical found in black, green, oolong and pekoe tea. This chemical is an amino acid

　　called L-theanine.” 可知，在black, green, oolong and pekoe tea里面发现了叫做L-theanine的化学成分。故答案为B。

　　2. Tea may help strengthen the body’s defense system because it helps ________.

　　A. the body to produce more interferon

　　B. the body to produce more gamma delta T cells

　　C. to add some bacteria to the blood cells

　　D. to mix antigens with some of the cells in the body

　　答案解析：答案为A。本题为推理题。由第二段 “Within twenty-four hours, the cells produced a lot of interferon, a substance that fights infection.” 可知，细胞产生interferon，它可以抵抗感染，故可推断，茶能增强身体的抵抗能力因为它能帮助身体产生更多的interferon。故答案为A。

　　3. According to Dr Bukowski, ________.

　　A. the findings of the study have already proved to be true

　　B. he has taken some amino acid L-theanine from tea and made a drug with it

　　C. further study is needed to prove the findings true

　　D. he is not sure whether tea can help prevent heart disease and cancer

　　答案解析：答案为C。本题为推理题。由最后一段首句 “Earlier research already has found that tea can help prevent heart disease and cancer.” 可知，D选项错误。由该段的后文 “Doctor Bukowski says the new study must be repeated with more people. If the findings prove to be true…”可知，A选项错误，C选项正确。由最后一句 “He says the amino acid L-theanine could be removed from tea and used as a drug to strengthen the body’s defenses.” 可知，Dr Bukowski认为可以从茶中提取amino acid L-theanine来制药，B选项与文意不符，故错误。

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