Elderly people who drink several cups of green tea a day are less likely to suffer from depression, probably due to a "feel good" chemical found in this type of tea, Japanese researchers said.
Several studies have    1  drinking green tea to lessening psychological problems and Kaijun Niu, of Tohoku University Graduate School, and colleagues found people    2   70 and older who drank four or more cups of green tea daily were 44 percent   3     likely to experience depression.
Green tea is widely   4    in many Asian countries,  5    China and Japan.
Niu's team   6     1,058 relatively healthy elderly men and women. About 34 percent of the men and 39 percent of the women had symptoms of    7  , according to the study that was   8      in the American Journal of Clinical Nutrition.
A total of 488 participants said they    9    four or more cups of green tea a day, 284 said they downed two to three cups    10   and the rest reported having one or fewer cups daily.
According to the researchers, the    11    effect of drinking more    12    tea on alleviating symptoms of depression did not    13   after they factored in social and economic status, gender, diet, history of medical problems and       14 of antidepressants.
There was no  15    between consumption of black or oolong tea, or coffee, and   16     symptoms of depression.
A green tea component, the amino acid thiamine（硫胺素）, which is   17    to have a tranquilizing（镇静的）  18   on the brain, may  19  the "potentially beneficial effect" shown in the current study, Niu noted,   20   that more study is needed.
(    ) 1. A. linked                 B. taken         C. considered               D. regarded
(    ) 2. A. aging                      B. aged          C. years                D. age
(    ) 3. A. more                B. little          C. less                  D. much
(    ) 4. A. sold                 B. planted      C. spread               D. consumed
(    ) 5. A. including          B. concluding C. containing               D. considering
(    ) 6. A. looked for               B. checked     C. investigated      D. asked
(    ) 7. A. optimism          B. happiness   C. bitterness          D. depression
(    ) 8. A. published         B. come out   C. appeared           D. showed
(    ) 9. A. ate                   B. drank               C. swallowed               D. chewed
(    ) 10. A. weekly           B. daily          C. monthly           D. yearly
(    ) 11. A. apparent         B. light          C. huge                D. gentle
(    ) 12. A. black                     B. oolong      C. coffee              D. green
(    ) 13. A. fade                      B. disappear   C. run                  D. decease
(    ) 14. A. influence               B. effect               C. use                   D. result
(    ) 15. A. association      B. use            C. comparison       D. difference
(    ) 16. A. lower             B. increase     C. strengthen         D. cause
(    ) 17. A. assumed          B. thought     C. imaged              D. hoped
(    ) 18. A. effect             B. affect               C. effort                      D. outcome
(    ) 19. A. report             B. confirm     C. complete          D. explain
(    ) 20. A. adding            B. addressing        C. speaking           D. saying