某小组利用图示实验装置来测量物块A和长木板之间的动摩擦因数μ．①把左端带有挡板的足够长的长木板固定在水平桌面上，物块A置于挡板处，不可伸长的轻绳一端水平连接物块A，另一端跨过轻质定滑轮挂上与物块A质量

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某小组利用图示实验装置来测量物块A和长木板之间的动摩擦因数μ．

①把左端带有挡板的足够长的长木板固定在水平桌面上，物块A置于挡板处，不可伸长的轻绳一端水平连接物块A，另一端跨过轻质定滑轮挂上与物块A质量相同的物块B．并用手按住物块A，使A、B保持静止．

②测量物块B离水平地面的高度为h．

③释放物块A，待物块A静止时测量其运动的总距离为s（物块B落地后不反弹）．

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      Everyone likes living in a clean and comfortable environment. If the envionment(环境) is bad, it will affect（影响）our bodies, and make us not feel well. Sometimes we may be terribly ill. At that time we don't want to work, and we have to stay in bed and rest at home. So the envrionment is very important to us.
      It's germ that makes us ill. There are germs everywhere, They are very small and you can't find them with your own eyes, but you can see them with a microscope（显微镜）. They are very small and there may be hundreds of them on a very small thing, Germs can always be found in the dirty water. When we look at dirty water under the microscope, we shall see them in it. Germs can also be found in air and dust（灰尘）. If you cut your finger, some of the dust from the floor may go into it, and you will have much pain in it. Sometimes the germs will go into all of your boby, and you will have pain everywhere.
     To keep us healthy, we should try to our best to make our environment become cleaner and tidier. This needs us to act together.

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