[单项选择]

New Brain Cells Love to Learn

Wisdom in old age depends on a fresh supply of new brain cells, a study in mice suggests. When mature mice learn a new task, their newly generated brain cells are three times more active than their old ones, the researchers found. The findings add to a growing body of evidence that the adult brain needs a steady addition of new cells to maintain its mental faculties.
Paul Frankland at the Hospital for Sick Children in Toronto, Ontario, Canada, and colleagues injected a group of mice with a chemical agent that stains only those cells born in the animals’ brains at the time of injection.
One week later, the team taught some of the mice how to navigate through a maze (迷宫), before sacrificing them to analyse the cells in a region of the brain called the hippocampus(海马体),which is key to learning and memory. In stages, the rest of the mice also underwent this paired process of learning and hippocampal exa
A. The mice were given injections for a week.
B. The mice died of the side effects of the injection.
C. The mice were tested and examined at different times.
D. The injection ’affected the mice till they were examine

[单项选择]
Wisdom in old age depends on a fresh supply of new brain cells, a study in mice suggests. When mature mice learn a new task, their newly generated brain cells are three times more active than their old ones, the researchers found. The findings add to a growing body of evidence that the adult brain needs a steady addition of new cells to maintain its mental faculties.
Paul Frankland at the Hospital for Sick Children in Toronto, Ontario, Canada, and colleagues injected a group of mice with a chemical agent that stains only those cells born in the animals’ brains at the time of injection.
One week later, the team taught some of the mice how to navigate through a maze (迷宫), before sacrificing them to analyse the cells in a region of the brain called the hippocampus(海马体),which is key to learning and memory. In stages, the rest of the mice also underwent this paired process of learning and hippocampal exa
A. Adult brains need new cells to maintain their functions.
B. Only old people need a steady addition of new cells to maintain their brain functions.
C. Old people will lose their wisdom completely.
D. Newly generated brain cells are a little more active than old ones.

[单项选择]Wisdom in old age depends on a fresh supply of new brain cells, a study in mice suggests.. When mature mice learn a new task, their newly generated brain cells are three times more active than their old ones, the researchers found. The findings add to a growing body of evidence that the adult brain needs a steady addition of new cells to maintain its mental faculties.
Researchers found that mature mice’s brain cells are much more active than before when
A. they are transplanted with new brain cells.
B. they learn to do something new.
C. they gain weight in the body.
D. they get new cells from other mic

[简答题]Old age and seniority alone do net command authority among the British: in fact modem life bas been developing so fast that old people often appear tiresome and out of date. Thus, "We need some young blood" is often heard in the organizations where the energy and modern methods of younger men are felt to be more likely to succeed than the long but partly irrelevant experience of older ones. The wisest of the older generation realize this. They either make an effort to remain young in heart and keep pace with the time, or else they let younger men take their place.
It follows that mature British have no desire to grow old or to look older than they are. Women especially, for reasons of sexual attraction, long to "stay young", and there is no greater compliment to a mature woman than to be told "How young you look!" On the other hand, if a woman’s hairstyle, make-up and clothes reveal an obvious effort to look artificially young, she is said to "look common", and is regarded with

[简答题]Americans find it difficult to think about old age until they arc propelled into the midst of it by their own aging and that of relatives and friends. Aging is the neglected stepchild of the human life cycle. Though we have begun to examine the socially taboo subjects of dying and death, we have leaped over that long period of time preceding death known as old age. In truth, it is easier to manage the problem of death than the problem of living as an old person. Death is a dramatic, one-time crisis while old age is a day-by-day and yea-by-year confrontation with powerful external and internal forces, a bittersweet coming to terms with one’ s own personality and one’ s life. (1)
We base our feelings on primitive fears, prejudice and stereotypes rather than on knowledge and insight. In reality， the way one experiences old age is contingent upon circumstances of late-life events (in what order they occur, how they occur, when they occur) and the social supports one receive