人体内的一些液体的正常pH范围如表，正常情况下，这些液体中一定呈酸性的是（ ）

城市的总体规划是指( )。

A．城市总体规划、镇总体规划的分阶段实施安排和行动计划，是落实城市、镇总体规划的重要步骤

B．城市在一定年限内各个组成部分和各项建设的全面安排

C．在法定规划的指导下来依法开发建设，减少随意性和盲目性；可以确保城市有序开发

D．作为保障规划实施的一个重要手段，城市近期建设规划从城市总体规划的一个内在组成部分演化和显化为一个独立规划，为宏观层次规划的实施搭建了一个平台

多数干式空气滤清器主要靠（）的方式使空气净化。

A、简单阻挡

B、粘性物质吸附

C、空气通过带有孔隙滤芯

D、离心除尘

Internet has become part of young people’s life. You can do lots of things on line such as chatting, sending messages and emails, getting useful knowledge and information, buying things without going to the shops, visiting cool websites, and so on. But it’s also easy to be cheated online. Here’s a story about a girl named Mary.

Mary is an 18-year-old girl who lives in New York. The people in Mary’s family are so busy that they hardly have time to be with her. In fact, Mary is quite lonely. So she spends a lot of time on QQ.

Last year Mary made a very special friend on QQ. His name was David and he lived in San Francisco. David was full of stories and jokes. He and Mary had a common interest in rock music and modern dance. So it always took them hours to talk happily on QQ and sometimes they even forgot the time. David sent Mary a picture of “himself”: he was a tall, good-looking young man with a big, happy smile. As time went by, they became good friends and often sent cards and small things to each other.

Before David’s birthday, Mary wanted to give him a surprise. She flew to San Francisco. But when Mary knocked on David’s door, she found that the special friend was a twelve-year-old boy named Jim!

So when you make friends on the Internet, please be careful. Here are some rules to make sure you are safe and have fun on the Internet.

u    Don’t give your password to anyone else, and never let out the following information: your real name, home address, age, school, phone number or other personal information.

u    Never agree to meet someone you met on the Internet without your parents’ permission. Never meet anyone you met online alone.

u    Always remember that people online may not be who they say they are. Treat everyone online as if they were strangers.

u    Remember — not everything you read on the Internet is true.

小题1:Why does Mary spend a lot of her time on QQ?

A．Because she feels lonely.

B．Because she doesn’t like learning.

C．Because she wants to make a boyfriend.

D．Because she likes computer games.小题2:Mary thought David was special because __________.

A．he was tall and good-looking

B．he sent her a picture of himself

C．he was from San Francisco

D．he made her quite happy on QQ.小题3:It’s good for children to _________ on the Internet.

A．give password to others

B．get useful knowledge and information

C．give phone number to others

D．believe everything they read小题4:What shouldn’t be done when you are online according to the passage?

A．Sending messages and emails.

B．Visiting cool websites.

C．Giving your real name to others.

D．Treating everyone online as strangers.小题5:What’s the main idea of this passage?

A．Things might not be real on the Internet.

B．It’s not good to chat on QQ.

C．Don’t meet some one you get to know on QQ.

D．Don’t buy anything on line.

现代汉民族的共同语是以北京语音为标准，以北方话为基础方言，以典范的现代白话文著作为语法规范的普通话。对这段话的正确理解是( )

A．现代汉民族的共同语就是普通话

B．福建是汉民族的一部分，所以闽南话属于现代汉民族的共同语

C．汉民族共同语就是在汉民族范围内使用的所有语言，包话吴、湘、赣、闽等方言

D．北方方言是汉民族的共同语

进行正向可交割跨期套利的核心在于购买成本的计算。（）