单项选择题

With regular exercise, the body builds up its levels of BDNF (brain-derived neurotrophic factor), and the brain’s nerve cells start to branch out, join together and communicate with each other in new ways. This is. the process that underlies learning: every change in the junctions between brain cells signifies a new fact or skill that’s been picked up and stowed away for future use. BDNF makes that process possible. Brains with more of it have a greater capacity for knowledge. On the other hand, says UCLA neuroscientist Fernando Gámez-Pinilla, a brain that’s low on BDNF shuts itself off to new information,
What will happen if a person has a brain that’s low on BDNF

A. He will be able to learn many new skills.
B. He will forget all the information stored in his brain.
C. He will be able to learn things quickly.
D. He will not pick up new information quickly.
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The people who are to be happy fix their attention on the conveniences of things, the pleasant pans of conversation, the well-prepared dishes, the goodness of the wines, the fine weather. They enjoy all the cheerful things. Those who are to be unhappy think and speak only of the contrary things. Therefore, they are continually discontented. By their remarks, they sour the pleasure of the society, offend many people, and make themselves disagreeable everywhere. If this turn of mind were founded in nature, such unhappy persons would be the more to be pities. The tendency to criticize and be disgusted is perhaps taken up originally by imitation. It grows into a habit, unknown to its possessors. The habit may be strong, but it may be cured when those who have it are convinced of its bad effects on their interests and tastes. I hope this little warning may be of service to them, and help them change this habit. The phrase sour the pleasure of society most probably means
A. having a good taste to the pleasure of society.
B. not being content with the pleasure of society.
C. feeling unhappy with the pleasure of society.
D. enjoying the pleasure of society.
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After a generation of non-fault divorce in America, law-makers in some states are being asked to make it harder to end a marriage when one spouse does not want to call it off. Proposals in several states to make contested divorces harder to obtain are supported by conservative groups seeking to promote their concept of family values. These proposals would go back, in contested divorces cases, the old requirement that one spouse should show the other was at-fault , such as being unfaithful, abusive, a drug user or someone who deserts the marriage. That would be a big shift from current divorce laws. No-fault divorce law has been enacted throughout America since California put the first one on the books in 1970. Under such laws, someone can get a divorce on grounds that the marriage has broken down without having to claim wrongdoing by the other spouse. No-fault divorces can be obtained even if one spouse does not agree to dissolve the marriage. No-fault divorce law first came into practice in
A. a state in the west.
B. a state in the upper mid-west.
C. a state in the east.
D. a state in the nort
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