你了解簡(jiǎn)單實(shí)用的機(jī)械嗎?請(qǐng)根據(jù)下文內(nèi)容選擇相應(yīng)圖片,完成1-4題,并回答第5題。
Amazing Simple Machines Simple machines have few or no moving parts.They work by changing the direction or the amount of a force (力).The pulley,lever,wedge and inclined plane are four different simple machines.
(1) D D A pulley can move things from a low place to a higher one.It has a wheel that allows you to change the direction of a force.As you pull down on the rope,the wheel turns and whatever is tied to the other end goes up. |
(2) A A A lever helps move heavy things.When you push down on one side of a lever,the other side goes up.A seesaw is an example of a lever. |
(3) C C A wedge is a simple machine used to cut material in parts.Place the thin end of the wedge onto a log and hit it with a hammer.The wedge changes the direction of the force and it pushes the log apart. |
(4) B B An inclined plane can help you to carry heavy things.It is easier to move heavy things up on an inclined plane than to lift them straight up.You can roll the things along the inclined plane.It takes longer to move it up,but it can save your energy. |
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D
D
【考點(diǎn)】人與社會(huì).
【答案】D;A;C;B;D
【解答】
【點(diǎn)評(píng)】
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發(fā)布:2024/6/27 10:35:59組卷:2引用:1難度:0.8
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Most people make their living with their hands. But Tom makes his living with his feet. It's a very good thing, too.Tom's story happens in a very small city in England. His parents are very poor. Seven people live in their small house. Tom has no place to play but in the street.Tom's father often plays football. Little Tom wants to play football, too. So his father makes a soft ball for him to kick. It's a sock filled with pieces of old cloth. The little boy kicks it every day.At last Tom learns to kick a real football and he can play football very well.
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