号称拥有“运动员血液”的芬兰运动员埃罗·门蒂兰塔参加过4届冬奥会，共获7块奥运奖牌。有趣的是，门蒂兰

<span style="font-family: 宋体; ">号称拥有“运动员血液”的芬兰运动员埃罗·门蒂兰塔参加过</span><span lang="en-us">4</span><span style="font-family: 宋体; ">届冬奥会，共获</span><span lang="en-us">7</span><span style="font-family: 宋体; ">块奥运奖牌。有趣的是，门蒂兰塔几次在赛后血液检查中都被怀疑使用违禁药品，因为他血液中的红细胞数比其他运动员多出</span><span lang="en-us">20%</span><span style="font-family: 宋体; ">以上。科学家在调查了门蒂兰塔家族多达</span><span lang="en-us">200</span><span style="font-family: 宋体; ">人的血液样本后发现，门蒂兰塔出生时体内就已经存在着红细胞生成素受体</span><span lang="en-us">(EPOR)</span><span style="font-family: 宋体; ">基因突变，使得他的携氧能力提升了</span><span lang="en-us">25%</span><span style="font-family: 宋体; ">至</span><span lang="en-us">50%</span><span style="font-family: 宋体; ">。这就意味着他的血液能够携带比普通人更多的氧气，从而使他在滑雪比赛中速度更快、耐力更持久。</span> <span style="font-family:宋体;mso-ascii-font-family:calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:calibri;mso-hansi-theme-font:minor-latin">本段文字意在说明</span><span lang="en-us">( )</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:calibri;mso-hansi-theme-font:minor-latin">。</span> <span lang="en-us">A.</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:calibri;mso-hansi-theme-font:minor-latin">血液中的红细胞数量决定了运动员的运动能力</span> <span lang="en-us">B</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:calibri;mso-hansi-theme-font:minor-latin">．运动员的天赋与后天锻炼同样重要</span> <span lang="en-us">C</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:calibri;mso-hansi-theme-font:minor-latin">．基因的变异与运动能力密切相关</span> <span lang="en-us">D</span><span style="font-family:宋体;mso-ascii-font-family:calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:calibri;mso-hansi-theme-font:minor-latin">．运动员的速度和耐力取决于其红细胞生成素受体</span>