Cars are lots of fun, but they could also be dangerous．We have to be careful when we drive them or ride in them．
It's always a good idea to put on your seat belt when you're in a car．Why? Think about this example：You put an egg on a skateboard and give it a push．If the skateboard hits a stone, it will stop, but the egg won't．It will fly through the air, hit the ground and break．
Now, think what would happen if you tied the egg to the skateboard．When the skateboard hits a stone, the egg won't go flying, it will stay safely on the skateboard．
Volvo, a famous Swedish car maker, was the first to use seat belts in 1849．
Air bags are also very important for car safety, because sometimes a seat belt isn't enough．If the car is going really fast and runs into something, seat belts could even hurt the people who wear them．
Most newer cars have air bags in front of and next to the seats．When a car hits something, its airbags will come out quickly in less than one second－to keep the people inside safe．
(1)
The passage mainly tells us ________．
[ ]
A．
how seat belts work to make cars safe
B．
why we must tie the egg to the skateboard
C．
two important ways to keep safe in cars
D．
what air bags are
(2)
The writer gives the example of the egg to ________．
[ ]
A．
show why it is important to wear a seat belt when in a car
B．
tell us what a skateboard is
C．
tell us what a skateboard is
D．
tell us that eggs are easy to break
(3)
Seat belts can make cars safer because ________．
[ ]
A．
they are made of strong materials
B．
they can stop us from hitting other cars
C．
they can help us stay safely on the seats
D．
people are interested in them
(4)
Air bags are also important for cars because they ________．
A plant makes its own food in its leaves. Water comes to the leaves through the roots (根). Air gets into the leaves through very small holes. The green coloring in the leaves uses the water and air to make food for the plant. It also needs sunshine because a plant can make food only when the sun is shining.
Animals and people could not live without green plants. They both eat plants. People and some animals also eat the meat of some animals, and these animals eat plants.
(1)
A plant gets food from its leaves.
( )
(2)
The sun uses the water and air to make food for the plant.
( )
(3)
A plant has very small holes in its leaves for water to come in.
( )
(4)
A plant can make its food when it is a sunny day.
( )
(5)
From the article we know that people can’t get food without animals.
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