Now machines （机器）are widely used all over the world. Why are machines so important and necessary(必要的) for us? Because they can help us to do things better and faster.
A washing machine helps us to wash clothes fast. A printing machine helps us to print a lot of books, newspapers, magazines and many other things fast. Bikes, cars, trains and planes are all machines. They help us to travel faster than on foot.
The computer is a wonderful machine. It was invented not long ago. It not only stores(贮存) information (信息) but also stores numbers millions of times as fast as a scientist does.
Let’s study hard and try to use all kinds of machines to build China into a modern country.
Machines can help us to do things better and faster, so they_____.

A．are difficult to make	B．are expensive
C．are important but not necessary	D．are very helpful

Computers can store information and numbers_____ a scientist does.

A．a little faster than	B．as fast as
C．much faster than	D．much more slowly than

If we want to build China into a modern country. We must__________.

A．study hard

B．try to use all kinds of machines

C．invent many machines

D．all above

A printing machine can help us___________.

A．print a lot of books	B．read more books
C．invent many machines	D．wash clothes fast