Two recent studies have found that punishment is not the best way to influence behavior.

One showed that adults are much more cooperative if they work in a system based on rewards. Researchers at Harvard University in the United States and the Stockholm School of Economics in Sweden did the study.

They had about two hundred college students play a version of the game known as the Prisoner’s Dilemma. The game is based on the tension (紧张气氛) between the interests (利益) of an individual and a group. The students played in groups of four. Each player could win points for the group, so they would all gain equally. But each player could also reward or punish each of the other three players, at a cost to the punisher.

Harvard researcher David Rand says the most successful behavior proved to be cooperation. The groups that rewarded it the most earned about twice as much in the game as the groups that rewarded it the least. And the more a group punished itself, the lower its earnings were. The group with the most punishment earned twenty-five percent less than the group with the least punishment. The study appeared last month in the journal Science.

The other study involved children. It was presented last month in California at a conference on violence and abuse. Researchers used intelligence tests given to two groups. More than eight hundred children aged two to four the first time they were tested. More than seven hundred children aged five to nine.

The two groups were retested four years later, and the study compared the results with the first test. Both groups contained children whose parents used physical punishment and children whose parents did not. The study says the IQs--or intelligence quotients--of the younger children who were not spanked were five points higher than those who were. In the older group, the difference was almost three points.

Murray Strauss from the University of New Hampshire worked with Mallie Paschall from the Pacific Institute for Research and Evaluation. Professor Strauss has written extensively about physical punishment of children. He says the more they are spanked, the slower their mental development. He also looked at average IQs in other nations and found them lower where spanking was more common.

D-25．Which could be the best title of the passage？

A
Punishment

B
The Best Way to Influence Behavior.

C
Punishment or Reward: Which Works Better on Behavior?

D
Two Recent Studies.

正确答案：C学生答案：C
老师点评：
答案解析：
选择最佳标题。A项太片面；文章没有提到最好的方法，排除B；D项不够具体；根据第二段“One showed that adults are much more cooperative if they work in a system based on rewards.”和第六段“of the younger children who were not spanked were five points higher than those who were”可知，研究表明，奖励能够促进合作，惩罚不利于孩子的心智发展，故选C。

题型：单选题客观题分值2分难度：简单得分：2
26
阅读D-25题干中Passage Three材料，完成本题。

D-26．The underlined word “spanked” probably means_____.

A
won

B
punished

C
tested

D
praised

正确答案：B学生答案：B
老师点评：
答案解析：
猜测词义题。根据带第六段“who were not spanked were five points higher than those who were”可知，被父母体罚的孩子，他们的智商比没有受到体罚的孩子的低5分，根据最后一段“He says the more they are spanked, the slower their mental development.”可知，孩子受到的惩罚越多，他们的心智发展得越慢，说明划线词是“惩罚”的意思，故选B。

题型：单选题客观题分值2分难度：中等得分：2
27
阅读D-25题干中Passage Three材料，完成本题。

D-27．According to the passage, the researchers may agree the best way to influence behavior is______.

A
rewarding good behavior

B
correcting bad behavior

C
punishing badly-behaved children

D
praising well-behaved children

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