问题 选择题
如图所示,用弹簧测力计拉着木块在水平桌面上做直线运动,实验记录如下表.由此可知,木块与水平桌面的滑动摩擦力为(  ) 

 实验次数 1 2 3
 木块运动情况 越来越快 匀速运动 越来越慢
 

 弹簧测力计示数/N

4.532.1

A.4.5 N

B.1.5 N

C.3 N

D.2.1 N

答案

答案:C

阅读理解

阅读短文,根据其内问题。

     Today is the Earth Day. Our reporter Nick Ford interviewed several people in the street. This is what they

told him:

     9:24 Miss Mayfield, a young teacher

     I try to tell my students the importance of our relations with wild animals. I take them to zoos and forests,

and I avoid using materials that come from wild animals, for example, ivory, which comes from elephants. I

don't wear things made of fur, and I even avoid buying leather shoes. Wool is okay, though-the sheep don't

get hurt!

     10:03 Mr. Perdue, a businessman

     I don't use my car for short journeys. I walk or go by bike. It's good for my health, and it doesn't pollute

the air.

     10:30 Tom Pitt, a 14-year-old student

     I only buy writing paper and notebooks made from recycled paper. And when I buy something made of

wood, like a wooden table, I'll make sure that the wood comes from a forest where they plant new trees.

     11:01 Mr. White, an artist

     I'm an artist, and I enjoy recycled art. They are things made out of rubbishlike this model plane made from

old containers. In fact, I hate throwing things away. I even keep my old woolen clothes and cotton

handkerchiefs and use them for cleaning.

     11:35 Ms Nelson, a policewoman

     I'm careful not to waste electricity. For example, I always turn the lights off when I leave a room. And I

don't have the TV on when I' m not watching it.

     12:00 Mr. Parks, a doctor

     I take my empty bottles, jars, and anything else made of glass to the recycling center, every week. I try

not to buy plastic bottles because you can't recycle most kinds of plastic.

1. Is Miss Mayfield a young teacher?

    __________________________________________

2. Who doesn't use a car for short journeys? 

    __________________________________________

3. Where does Mr. Parks go every week? 

    __________________________________________

4. What is recycled art?

    __________________________________________

5. What are these people trying to do? 

    __________________________________________

选择题