What are simple machines？They are inventions that people invented thousands of years ago to make their lives easier.Do you know that we use those same simple machines every day in our modern world？Let's look at some of our modern inventions that are in fact simple machines!
The Lever
There are many modern inventions that are levers.A pair of scissors is a lever.Also，when you ride on a seesaw （蹺蹺板） in the playground，you're using a lever.The board rests on a point in the middle.When you push down on one end of the board，the other end goes up.
The Wheel and Axle
A wheel and axle（車軸） is a simple machine，but important for many modern inventions.Anaxle goes into the middle of a wheel，making it easy to turn.Without the wheel and axle，we wouldn't have cars，trucks and bicycles.They all use a wheel and axle.
The Ramp
A ramp is a flat（平的） surface that has one high end and one low end.This simple machine makes it easier and safer to go up or down.People in wheelchairs use ramps to go in and out of buildings.There are many ramps in nature，too.They are called hills and mountains!
The Wedge
A wedge is like two ramps put together so that one edge（邊緣） is sharp.You might ask， "When would I need a wedge？" If you enjoy eating，you need one almost every day!A knife and a fork are both wedges which cut into food.So is an axe （斧子），which people use to cut wood in to pieces.
（1）Why did people invent simple machines in the past？ CC
A．To create modern inventions.
B．To change people's thoughts.
C．To make lives more convenient.
D．To be used in the modern world.
（2）Which of the following is a ramp？ CC
A.
B.
C.
D.
（3）What can you know from the text？ DD
A．Scissors and knives are both levers.
B．Ramps help people get into wheelchairs.
C．The wheel and axle is a modern invention.
D．Wedges can be used to cut wood into pieces.
（4）What's the purpose of this text？ BB
A．To tell readers how to use modern inventions.
B．To introduce some simple machines to readers.
C．To give readers advice on how to live easier lives
D．To teach readers how to invent modern inventions.
【答案】C；C；D；B
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：4引用：1難度：0.6
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