Reading Comprehension 从下列每篇短文的问题后所给的四个选择项中选出一个最佳答案。 Are we getting more intelligent? The fact is that IQ scores have increased sharply in many countries of the world, Britain, the USA, Argentina, China and Canada to name only a few. The average child today is as bright as the near genius of 50 years ago."This destroys our belief about the rigidity of IQ, "says Prof Neisser of Cornell University. Even if we do not consider the problem of whether IQ is a satisfactory description of intelligence, we still have to find an explanation for this increase. Neither nature nor environment alone answers the question. Some research indicates that genetics accounts for 75% of the difference between one individual and another. So there's not much room for environment. But in a group of people genes do not change fast enough to explain the rise in scores over the last 50 years. And in any case most psychologists continue to believe that genes explain the differences in IQ. A recent study by Dickens and Flynn suggests that genes do indeed have an important effect, because they encourage people to look for certain environments and certain life experiences. Biologically bright children tend to enjoy school, books, puzzles, asking questions and thinking abstractly. All these things tend to increase brainpower. You will probably study more, choose bright children of the same age as friends, thus boosting your intelligence even more. A child who loves stories will ask his parents to read to him night after night. This will improve his cognitive skills and he will perform better at school. On the other hand a child biologically less gifted may get frustrated at school and come to hate learning, thus reinforcing his genetic tendencies.