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问题 单项选择题

正规式（1|3|5）（202）（c|de）表示的正规集合中元素数目为（），（）是该正规集合中的元素。

正规式（1|3|5）（202）（c|de）表示的正规集合中元素数目为（）

A．6

B．7

C．8

D．无穷

答案

参考答案：A

阅读理解
I am a teenager. I want to use the Internet. I know that there are rules about what I should do online. I agree to follow these rules, and my parents agree to help me follow these rules:
1. I will not call or meet anyone alone that I meet online unless my parents say it’s okay.
2. I will not buy or order anything online without my parents’ permission.
3. I will not fill in any form online that asks me for any information about myself or my family without asking my parents first.
4. If someone sends me any pictures or any e-mails using bad language, I will tell my parents.
5. If someone asks me to do something that I am not supposed to do, I will tell my parents.
6. I know that my parents want to make sure I’m safe online, and I will listen to them when they ask me not to do something.
Rules for going online for teenagers
Things teenagers
Shouldn’t do
小题1:Don’t go to call or meet anyone you have met online    .
小题2:Although you want to buy something you like, you shouldn’t tell others information about         or your family such as your parents’ credit card（信用卡） number.
Things teenagers
Should do
小题3:If someone sends you any pictures or any e-mails using ______ language, tell your parents.
小题4:If others online tell you to do      that you are not supposed to do, tell your parents.
Things
parents do
小题5:If you break the rules, your parents will be unhappy because they want you to be         at all times.
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选择题
已知⊙O1与⊙O2的半径分别为3和4，若圆心距O1O2=1，则两圆的位置关系是（   ）
A．相交
B．相离
C．内切
D．外切
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