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问题 单项选择题

电位是相对量，随参考点的改变而改变，二电压是（），不随参考点的改变而改变。

A、衡量

B、变量

C、绝对量

D、相对量

答案

参考答案：C

单项选择题 A1型题

以下是风湿热主要表现的是

A．不规则发热

B．关节疼痛

C．心电图上P-R延长

D．上肢伸侧有环状红斑

E．血沉增快
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阅读理解
阅读理解。
     Today's teens have a knowledge of the Internet that often surpasses that of their parents. Because so many
teens are Internet savvy, it is important that they also have an understanding of the dangers that exist online and
how to deal with them. Watch teens share their own "Real-Life Stories" about issues affecting them on the
Internet such as cyberbullying (网络欺凌), online enticement, and giving out too much personal information.
NSTeens-Terrible text                                                                                         
     Some teens say and do terrible things to each other online because they don't see the direct effects of
their actions. So what should you do if you're cyberbullied? Watch the NSTeens in their latest video,
"Terrible text," about a young girl who is troubled when a cyberbully sends mean text messages to her
cell phone at all hours of the day and night.
     Visit NSTeens.org.
NetSmartz411                                                                  
     NetSmartz411 is a parent and guardian's premier, online resource for learning about Internet safety,
computers, and the Web.
     Search our knowledge base for answers to all of your questions about the online world! If you can't
find what you're looking for, use the "Ask the Experts" tab to send us a question.
     Your question will be answered by professionals who know a lot about Internet safety-the real-life
analysts at the National Center for Missing & Exploited Children. We handle daily reports about the online
exploitation of children; and we'll show you the steps you can take to keep the children and teens in your
life safer online.
     Visit NetSmartz411.org.
CyberTipline Report                                                                                     
     The CyberTipline is the place to report any incidents of Internet exploitation. If you find yourself in a
situation where you need help, visit www.cybertipline.com and make a report. If you fear that you are in
immediate danger, contact your local law enforcement (执法部门).
Real-Life Stories                                                                                                        
     Watch real-life stories told by teens who have been victims of Internet exploitation.
     Real-Life Stories
NetSmartzKids
     Are you concerned about your younger siblings' (兄弟姐妹的) safety online? Visit
www.NetSmartzKids. org with them to help them learn how to avoid the dangers that exist on the
Internet.
1. The ad is intended for _____.
[ ]
A. kids loving to play games online
B. only victims of Internet use
C. kids and their parents who want to learn about the safety online
D. pre-school students who know little about Internet
2. If you visit the website, you can _____.
[ ]
A. share your friends'Real-life Stories about issues affecting them on the Internet
B. have an understanding of the dangers that exist online and how to deal with them
C. say and do terrible things to each other online
D. ask for help when you have difficulty with your study
3. If you visit www.cybertipline.com, you can _____.
[ ]
A. contact your local law enforcement
B. search our knowledge base for answers to all of your questions about the online world
C. report any incident of Internet use
D. help your siblings learn how to avoid the dangers that exist on the Internet.
4. Which of the following stories you can share on the Real-Life Stories?
[ ]
A. Teen murdered by man she met in chat room.
B. Problem of losing weight.
C. Left home alone.
D. Hurt by second hand smoke in the Internet cafe.
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