杭州市2017高考英语阅读理解一轮基础练习（2）及答案

　　较难题目特训：科普知识类

　　阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。

　　Like distance runners on measured course, all of us will move through time in a roughly predictable pattern.

　　In the first stage of our lives, we develop and grow, reaching toward the top of physical vitality (energy).

　　After we grow up, however, the body begins a process of gradually wearing out.

　　A new awareness of physical fitness may help lengthen our years of health and vitality, yet nothing we do will work to stop the unavoidable force of aging.

　　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.

　　Finally, 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.

　　In 1932, a classic experiment nearly doubled the lifetime of rats, simply by cutting back the calories (unit for measuring the energy value of food)in their diet. The reason for the effect was then unknown.

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