Question

1. [原文] Doctors are of the opinion that most people cannot live beyond 100 years,but a growing number of scientists believe that the aging process can be controlled. There are more than 12,000 Americans over 100 years old,and the number is increasing each year. Dr James Langley of Chicago claims that,theoretically and under ideal (理想的) conditions,animals,including man,can live six times longer than their normal period of growth. A person’s period of growth lasts about 25 years. If Dr Langley’s theory is accurate,future generations can expect a life span (寿命) of 150 years.

[问题]这段话的中心句是        

[方法总结]        

Answer 1

1. [答案]If Dr Langley's theory is accurate,future generations can expect a life span (寿命) of 150 years.

[方法总结]中心句在段尾。