遇前方视线不良好的弯道时，鸣喇叭后靠右侧行驶。

社会主义核心价值体系是兴国之魂，是社会主义先进文化的精髓，决定着中国特色社会主义发展方向。以下关于社会主义核心价值体系表述错误的是：

A．社会主义核心价值体系的灵魂是马克思列宁主义、毛 * * 思想、邓 * * 理论和“三个代表”重要思想．基础是社会主义荣辱观
B．社会主义核心价值体系以理论层面为主导，统领理想、精神、道德等不同层面，四者相辅相成、相互促进，构成一个完整的体系
C．中国特色社会主义共同理想是马克思主义基本原理同中国实际相结合的产物，是科学社会主义在当代中国的主要表现形式
D．以爱国主义为核心的民族精神和以改革创新为核心的时代精神是社会主义核心价值体系的精髓，是马克思主义与时俱进的思想源泉

某同学用100g含碳酸钙90%的大理石与足量稀盐酸发生反应，化学方程式为CaCO₃+2HCl==CaCl₂+H₂O+CO₂↑。若该实验条件下CO₂的密度为1.9g/L，计算生成二氧化碳气体的体积。（计算结果保留1位小数）

阅读理解。

      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 math skill."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.

1.The main subject talked about in this passage is __________.

A.science on learning a second language

B.man's ability of learning a second language

C.language can help brain power

D.language learning and math study

2.In the second paragraph,the writer mentions "exercise" in order to _________.?

A.say language is also a kind of physical labor

B.prove that one needs more practice when he/she is learning a language

C.to show the importance of using the language when you learn the language

D.make people believe language learning helps grey matter work well

3.The underlined word "bilingual" probably means __________.

A.a researcher on language learning

B.a second language learner

C.a person who can speak two languages

D.an active language learner

4.We may know from the scientific findings that ___________.

A.the earlier you start to learn a second language the higher the grey matter density is

B.there is no difference between a later second language learner and one who doesn't know a second

language

C.the experience of learning a second language has bad effect on people's brain

D.the ability of learning a second language is changing all the time

5.In the last two paragraphs,the author wants to tell us that _________.

A.learning a second language is the same as studying math

B.early learning of a second language helps you a great deal in study other subjects

C.Italian is the best choice for you as a second language

D.you'd better choose the ages between 2 and 34 to learn a second language

1948年年底到1949年初，中 * * 决定执行“不承认国民党政府同各国建立的旧的外交关系，对于驻在旧中国的各国使节，只当普通侨民看待，而不当作外交代表看待”的外交政策。该外交政策是                   （   ）

A．“另起炉灶”

B．“一边倒”

C．“打扫干净屋子再请客”

D．“求同存异”

进入PCT程序后，自优先权日起（）内，可以收到检索报告。

A.12个月

B.16个月

C.18个月

D.30个月