BDDDC
1.B 推理题。根据本句we meet a stress,a stress that is greater than our physical resistance.Often,it is only a minor accident or chance infection(a disease caused by virus),but this time,it brings life to an end.说明这里的it指上的stress,它让我们的生命结束。
2.D 细节题。根据文章第五段Most of the changes of aging take place deep inside the body.The lungs become less able to take in oxygen.Powerful muscles gradually lose their strength.The heart loses power and pumps less blood.Bones grow easier to break.说明ABC都是变老的变化,D项表述错误,肺部不是不能吸入氧气,是吸入氧气变少。
3.D 推理题。根据文章第五段Most of the changes of aging take place deep inside the body.The lungs become less able to take in oxygen.Powerful muscles gradually lose their strength.The heart loses power and pumps less blood.Bones grow easier to break.这里很多变老的症状都表现在外在了,故D说法错误。
4.D 细节题。根据文章倒数第四段a classic experiment nearly doubled the lifetime of rats,simply by cutting back the calories in their diet说明D正确。减少了饮食中的卡路里,与D项相符。
5.C 主旨大意题。本文讲述了一个新的科学发现,是对人类变老的研究,结果发现我们可以延长我们的衰老过程,以延长我们的生命。故C正确。
考点:考查科普类短文阅读
点评::本文讲述了一个新的科学发现,是对人类变老的研究,结果发现我们可以延长我们的衰老过程,以延长我们的生命。科普类短文阅读会遇见较多的生词,在遇见生词的时候要学会根据上下文语境进行推理猜测其意思,减少语言的障碍,本文的关键在于细节的定位较为重要。