第一部分阅读理解（共两节，满分40分）
第一节（共15小题：每小题2分，满分30分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
A
In the past decade the number of people living past 100 has increased by 71 percent. While one expert believed this figure will continue to rise, he stated that anyone hoping to live for double or triple（三倍） this time will be disappointed. Speaking at a conference, Colin Blakemore, 70, a Britishscientist, claimed there is a ceiling on how long humans can live, and six score years “might be a real absolute limit to human lifespan.”
