（1）What does the writer think of the machines？
A.Useful.
B.Useless.
C.Interesting.
（2）Which machine can help us wash clothes？
A.The washing machine.
B.The microwave oven.
C.The computer.
（3）What is the printing machine used for？
A.It's used for printing books and other food.
B.It's used for making things.
C.It's used for playing in the park.
（4）What can buses，bikes and cars help us to do？
A To travel faster.
B.To travel cheaply.
C.To save money.
（5）What does the writer think is the most important invention？
A.The car.
B.The computer.
C.The TV.