What makes one person more intelligent than another What makes one person a genius, like the brilliant Albert Einstein, and another person a foolAre people born intelligent or stupid, or is intelligence the result of where and how you liveThese are very old questions and the answers to them are still not clear.
We know, however, that just being born with a good mind is not enough. In some ways, the mind is like a leg or an arm muscle(肌肉). It needs exercise. Mental(done with the mind)exercise is particularly important for young children. Many child psychologists (心理学家)think that parents should play with their children more often and give them problems to think about. The children are then more likely to grow up bright and intelligent. If, on the other hand, children are left alone a great deal with nothing to do, they are more likely to become dull and unintelligent.
Parents should also be careful with what they say to young children. According to some psychologist
A. Great.
B. Handsome.
C. Clever.
D. Busy.
Clever genetic detective work may have found out the reason why a near-starvation diet prolongs the life of many animals.
Ronald Kahn at Harvard Medical School in Boston, US, and his colleagues have been able to extend the lifespan (寿命) of mice by 18 percent by blocking the rodent’s (啮齿动物) increase of fat in specific cells. This suggests that thinness—and not necessarily diet— promotes long life in "calorie (热量单位, 卡) restricted" animals.
"It’s very cool work, "says aging researcher Cynthia Kenyon of the University of California, San Francisco. "These mice eat all they want, lose weight and live longer. It’s like heaven."
Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown, partly because few people are willing to su
A. 3 years
B. 753 days
C. more than 3 years
D. 887 days
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