题目内容

A number of books in the library ____ been stolen so that the number of them ____ smaller than before.

A. has, are B. has, is

C. have, is D. have, are

C

【解析】试题分析：考查谓语动词单复数。a number of 意思是“许多...”，后接复数名词，谓语通常用复数；the number of 意思是“.....的总数”，后接复数名词，但谓语要用单数，句意：在图书馆很多书已经被偷了因此书的总数比以前更少了。故选C

考点：考查谓语动词单复数

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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 matter. 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, 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 "early bilinguals" who had learnt a second language before the age of five, as well as a number of later learners.

Scans showed that grey matter density (密度) in the brain was greater in bilinguals than in people without a second language. But the longer a person waited before mastering a new language, the smaller the difference.

"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 (灵活的),"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 34. 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.

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