题目

Human beings are sure to grow old and have a certain life span.But People have always dreamed of__36__ eternally young. Some people have gone_37_ in the_38_ of finding eternal life. Others have spent __39__ trying to stop the signs of age and extend their natural life. It seems that their efforts must_40__ . And yet,some people today take the idea very seriously that it is_41_ to keep our bodies young and to live much longer than we do now.    One man_42__  believes this is Dr Aubrey de Grey, a scientist based in Cambridge, UK. Dr de Grey is __43__ that in about 20 years, we will hav（2007•开封）下列事件中是必然事件的是（ ）A．打开电视机，正在播广告B．从一个只装有白球的缸里摸出一个球，摸出的球是白球C．从一定高度落下的图钉，落地后钉尖朝上D．今年10月1日，厦门市的天气一定是晴天