CT的脊髓造影，其对比剂的注射方法是（） A.动脉插管给药 B.静脉给药 C.通过口

已知两个正四棱锥有公共底面，且底面边长为4，两棱锥的所有顶点都在同一个球面上若这两个正四棱锥的体积之比为1：2，则该球的表面积为______．

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

乳腺癌钼靶X线的表现为（）

A.密度均匀的肿物，边界较清晰、整齐

B.密度均匀的肿物，可见圆圈及小斑片状钙化

C.片状或结节状致密影，和周围腺体组织密度类似

D.高密度影肿物，边缘呈毛刺状，可见小簇状、沙砾样钙化

E.密度不均匀，边界不清楚

认真进行预防接种，预防小儿麻痹症的发生。向广大群众和医务人员说明小儿麻痹症的发生发展过程，以便尽早发现、及时治疗，预防疾病的发展而引起的残疾属于（）

A.一级预防

B.二级预防

C.三级预防

D.防截肢

E.防精神障碍

资产负债表日，企业应将以公允价值计量且其变动计入当期损益的金融资产的公允价值变动计入当期损益，核算时应通过“资产减值损失”科目核算。 ( )