题目内容
（请给出正确答案）
A．three fourths
B．three fourth
C．threes fourths
D．threes fourth
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更多“At least he was there in time …”相关的问题
A.No, he is not ther
B.Yes, what do you want？
C.Hold on.I’ll get him.
D.Yes, Tom is m
E.
Why does the woman suggest that the man visit her office in the afternoon？
A．She isn't there in the morning.
B．Her assistant isn't there in the morning.
C．She won't have the forms he needs until the afternoon.
D．She isn't as busy in the afternoon.
Can Drugs Make Us Happier？ Samrter？
It depends on what is meant by "happy" and "smart."
There are already drugs that brighten moods, like Prozac, and other antidepressants that control levels of a brain chemical called serotonin. While originally meant to treat depression, these drugs have been used for other psychological conditions like shyness and anxiety and even by otherwise healthy people to feel better about themselves.
But is putting people in a better mood really making them happy？ People can also drown their sorrows in alcohol or get a euphoric feeling using narcotics, but few people who do so would be called truly happy.
The President's Council on Bioethics said in a recent report that while antidepressants might make some people happier, they can also substitute for what can truly bring happiness: a sense of satisfaction with one's identity, accomplishments and relationships.
"In tike pursuit of happiness human beings have always worried about falling for the appearance of happiness and missing its reality," the council wrote. It added, "Yet a fraudulent happiness is just what the pharmacological management of our mental lives threatens to confer upon us."
Now the race is on to develop pills to make people smarter, at least in one sense. These drugs, several of them already in clinical trials, aim at memory loss that occurs in people with Alzheimer's disease or a precursor called mild cognitive impairment.
But it is lost on no one that if a memory drug works and is safe, it may one day be used by healthy people to learn faster and remember longer.
Studies have already shown that animals can be made to do both whelk the activity of certain genes is increased or decreased. Dr. Tom 'Fully, a professor at Cold Spring Harbor Laboratory, created genetically engineered fruit flies that he said had "photographic memory." In one session, he said, they could learn something that took normal flies 10 sessions.
"It immediately convinced everyone that memory was going to be just another biological process," Dr. Tully said. "There's nothing special about it. That meant that it was going to be treatable and manip-ulable."
But experts say that improving memory will not necessarily make one smarter, in the sense of I.Q. , let alone in wisdom. "It would be a mistake to think that drugs that have an impact on memory necessarily will have an effect on intelligence," said Dr. Daniel L. Schachter, chairman of psychology at Harvard.
Dr. Tully, who is also acting chief scientific officer of Helicon Therapeutics, which is developing memory pills, agreed. "You don't think better than you did before,' he said. "You just get the facts in with less practice. ' Still, he said, that would be significant help to students at exam time.
Any pill used widely by healthy people to improve memory would have to be extremely safe, so that the risks would not outweigh the benefit. Psychological side effects also remain a possibility.
"Is it a good thing to remember everything？" Dr. Tully asked. Could a brain too crammed with information suffer some sort of overload？
Dr. Joe Z. Tsien, a professor of molecular biology at Princeton who genetically engineered smarter mice a few years ago, says he is skeptical that the results can be transferred to people.
"If you look at how people improve their brain power, it's through education," he said. "That has proven to have 100 percent efficiency with minimal side effects."
There are already antidepressants that control levels of a brain chemical called serotonin.
A．Y
B．N
C．NG
A. most
B. best
C. least
D. foremost
A.very well
B.as well
C.at least
D.in the least
My Chinese teacher is at least ______ age ______ my father if he is not younger than him.
A．the same; with
B．the same; as
C．as; as
D．equal; to
At least he overstated ___________ (健康饮食对的重要性).
He has faults, ______ he is the best student of the class.
A．no the less
B．none the less
C．none the least
D．none the most
At least he overstated ____________ (健康饮食对孩子的重要性).
