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，”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 2 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.
The main subject talked about in this passage is（ ）.
主旨大意题。从第一段的句子：Haven’t you noticed that you have become smarter since you started to learn a language 可知文章讲述的正是学习另外一门语言可以让人更加聪明，可帮助提升脑力。故本题正确答案选A。
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
