关于良性前列腺增生症的药物治疗，选择以下哪一项是最恰当的（）
A.适用于轻、中度症状的前列腺增生症的患者
B.α受体阻滞药作用于前列腺腺细胞上，抑制前列腺增生
C.5–α还原酶抑制药抑制而降低前列腺内平滑肌张力
D.5–α还原酶抑制药抑制睾酮生成而降低前列腺内平滑肌张力
E.5–α还原酶抑制药抑制双氢睾酮生成而使前列腺部分萎缩
参考答案：E
解析：治疗前列腺增生症的两个主要药物是α受体阻滞剂和5–α还原酶抑制药，α受体阻滞药是通过作用于前列腺组织中平滑肌细胞的受体，使其松弛，降低 * * 阻力而起到缓解症状作用。5–α还原酶抑制剂是通过抑制体内睾酮向双氢睾酮转化，而起到使前列腺体积缩小，缓解症状。
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| When you're a preteen, a huge problem might be that you just have to have a new rock-rap CD, 1 your parents won't give you the money for it. I thought life was so 2 when things like this happened-until September 11, 2001. I was in P.E. when the planes hit the World Trade Center and the Pentagon. As soon as I got home and for weeks after, I saw the disaster 3 on TV. Seeing the innocent people running for their 4 as the debris(瓦砾) started coming down the fire and smoke rose out of the 5 brought tears to my eyes. I couldn't help imagining what the people on the 6 and in the buildings were thinking and going through, not 7 what was going on. I admired the courage of the firefighters who rushed in and risked their own lives to 8 others. It tore my heart apart to watch the 9 looks on the faces of so many people who didn't know if their loved ones were dead or alive while 10 in all the debris. Then it 11 me: All my life I had thought mainly of myself. I had it easy in life and had been taking it all for granted. A feeling of coldness 12 down my back, and I cried just thinking of the possibility that it could have easily 13 to my family. My mom or dad could have been killed like that, and I would never, ever see the m again. I began to evaluate what a real 14 in life was. This disaster 15 me that awful things can happen to anyone at any time. Now when my mom or dad or sister go somewhere, even if it's just 16 the store, I try to remember to tell them that I love them because I know there is a 17 that I may never tell them that 18 . Not getting a new CD is not going to make or 19 my life. I can live with those kinds of problems. But losing someone I love would 20 make my life miserable. 9/11 showed me just what I am. | |||
| ( )1. A. but ( )2. A. unbelievable ( )3. A. expand ( )4. A. lives ( )5. A. curtains ( )6. A. seats ( )7. A. believing ( )8. A. join ( )9. A. puzzled ( )10. A. hidden ( )11. A. rewarded ( )12. A. cooled ( )13. A. happened ( )14. A. relationship ( )15. A. taught ( )16. A. on ( )17. A. story ( )18. A. again ( )19. A. end ( )20. A. rather | B. so B. uncomfortable B. occur B. families B. buildings B. planes B. thinking B. save B. severe B. found B. surprised B. dropped B. compared B. problem B. reminded B. in B. doubt B. once B. change B. truly | C. or C. unfair C. strike C. houses C. gates C. corners C. knowing C. meet C. dirty C. placed C. hit C. ran C. related C. need C. persuaded C. at C. chance C. enough C. spare C. probably | D. for D. uncertain D. unfold D. friends D. bedrooms D. streets D. caring D. calm D. desperate D. trapped D. told D. passed D. turned D. fate D. informed D. to D. plan D. ever D. break D. frequently |