2. The author believes the following EXCEPT that ______.
A. human’s life pattern is predictable
B. physical fitness can’t stop the force of aging
C. human’s lifetime will last longer than 75 years
D. all of the changes of aging take place deep inside the body
3. How did Dr Paul Seagle lengthen the lifetime of rats in his experiment?
A. By limiting the protein in their diet.
B. By cutting the calories in their diet.
C. By resetting their clock of aging.
D. By keeping their physical fitness.
4. What is probably the best title for the article?
A. Two Great Experiments.
B. The Mystery of Human Life.
C. Ways to Lengthen Human Life.
D. The Breakthrough in the Study of Aging.
【参考答案】1—4、BDAD
阅读下列四篇短文,从每小题后所给的A,B,C或D四个选项中,选出最佳选项。
The term“multitasking” originally referred to a computer’s ability to carry out several tasks at one time. For many people, multitasking has become a way of life and even a key to success. In fact, some excellent mental aerobic exercises(大脑训练)involve engaging the brain in two or more challenging activities at a time. Although checking e-mail while talking on a phone and reading the newspaper may be second nature for some people, many times multitasking can make us less productive, rather than more. And studies show that too much multitasking can lead to increased stress, anxiety and memory loss.
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