与多模光纤相比较，单模光纤具有（）等特点。A．较高的传输率、较长的传输距离、较高的成
题型：单项选择题
问题：
与多模光纤相比较，单模光纤具有（）等特点。
A．较高的传输率、较长的传输距离、较高的成本
B．较低的传输率、较短的传输距离、较高的成本
C．较高的传输率、较短的传输距离、较低的成本
D．较低的传输率、较长的传输距离、较低的成本
题型：单项选择题
This Thursday, across the US, kids are skipping school(缺课)and going to work with their parents. They’ll be making copies, sending faxes(传真)and sweeping floors. This is because April 28 is Take Our Sons and Daughters to Work Day all over the US. This holiday shows kids what it means to be a grown-up in the working world.
I still remember when this day started, I was very happy. Not only did I have the chance to miss school, but I also got
to sit in my dad’s taxi all day long and we would go to a 
restaurant for lunch.
But after only 20 minutes of driving around the city. I was very bored. I couldn’t read my book in the car as I would get carsick(晕车)and my dad didn’t like to turn on the radio. I got hot and uncomfortable. people wouldn’t get into his taxi because they thought he already had a passenger: me—so nothing happened. It seemed years before we went out for lunch. I actually started to miss school.
While the point of the day is to give kids a chance to experience real-life jobs and give them an idea of the possibilities(可能性) for their futures, I got something completely different from the day. I learned to appreciate(重视) school. Where else do you get to play with your friends, do science experiments, read great books and write stories all in one day?
Just as you’ll have to learn to love your job later in life, learn to love school now. If you don’t already, try spending the day at work with your dad.
小题1:When is the “Take Our Sons and Daughters to Work Day”all over the US?
A．On February 28.
B．On March 28.
C．On April 28
D．On May 28.小题2:That day the writer was happy at first for the following reasons except _____.
A．she didn’t have to go to school
B．she would work as a grown-up
C．she could sit in her father’s taxi all day.
D．she would go our for lunch with her father小题3:Why didn’t people get into the writer’s father’s taxi?
A．Because her father didn’t like to turn on the radio.
B．Because they thought the writer was a passenger.
C．Because her father’s car was hot and uncomfortable.
D．Because her father didn’t stop to take any passengers.小题4:Which of the following is NOT the purpose of the “Take Our Sons and Daughters to Work Day”?
A．To teach kids to appreciate school.
B．To give kids a chance to experience real-life jobs.
C．To give kids an idea of the possibilities for their futures.
D．To show kids what it means to be adults in the working world.小题5:What did the writer learn that day?
A．It’s boring to drive a taxi.
B．Working with dad is fun.
C．It’s hard to make money.
D．School life is much better.