If English means endless new words, difficult grammar and sometimes strange pronunciation, you are wrong. Haven't you noticed that you have become smarter since you started to learn a language?

    According to a new study by a British university, learning a second language can lead to an increase in your brain power. Researchers found that learning other languages changes grey mater. This is the area of the brain which processes information. It is similar to the way that exercise builds muscles.

    The study also found the effect is greater when the younger people learn a second language. A team led by Dr. Andrea Mechelli, from University College London, took a group of Britons who only spoke English. They were compared with a group of bilinguals who had learnt a second language before the age of five, as well as a number of later learners.

    Scans showed that grey mater density(密度) in the brain was greater in bilinguals than in people without a second language.

    “Our findings suggest that the structure of the brain is changed by the experience of learning a second language,” said the scientists. It means that the change itself increases the ability to learn.

    Professor Dylan Vaughan Jones of the University of Wales, has researched the link between bilingualism and maths skills. “Having two languages gives you two windows on the world and makes the brain more flexible,” he said. “You are actually going beyond language and have a better understanding of different ideas.”

    The findings were matched in a study of native Italian speakers who had learned English as a second language between the ages of two and thirty-four. Reading, writing, and comprehension were all tested. The results showed that the younger they started to learn, the better. “Studying a language means you get an entrance to another world,” explained the scientists.

    A baby giraffe is born 10 feet high and usually lands on its back. Bringing a giraffe into the world is a tall order. In his book, A View from the Zoo, Gary Richmond describes how a new-born giraffe learns its first lesson.

    The mother giraffe lowers her head long enough to take a quick look. Then she puts herself directly over her child. She waits for about a minute, and then she does the most unreasonable thing. She throws her long leg and kicks her baby, so that it's sent sprawling (四脚朝天).

    When it doesn't get up, what the mother has done is repeated again and again. The struggle (挣扎) to rise is important. As the baby giraffe grows tired, the mother kicks it again. Finally, it stands for the first time. Then the mother giraffe kicks it off again. Why? She wants it to remember how it can get up. In the wild, a baby giraffe must be able to get up as quickly as possible to stay with its group, where there's safety.

    Another writer named Irving Stone understood this. He spent a lifetime studying great people, writing stories about such men as Michelangelo, Vincent van Gogh, Sigmund Freud, and Charles Darwin.

    Stone was once asked if he had found something unusual about these great people. He said, “I write about people who sometime in their life have a dream of something. They're beaten over the head, knocked down and for years they get nowhere. But every time they stand up again. And at the end of their lives they've realized some small parts of what they set out (着手) to do.”

①没有文化的继承，就没有文化的积累

②文化有其自身的传承性和相对独立性

③我们要对传统文化加以改造，使其顺应社会发展

④社会发展侵蚀了传统文化的基本特征

下列关于分子动理论及有关现象的叙述，其中正确的是