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mobile
phone
It has at least 4 parts.
People can use it to get on the Internet.
It has a keyboard and a mouse.
computer
Let’s look at more inventions!
light bulb
carriage
wheel
candle
7
What can we use these inventions to do?
We can use ______ to _____________.
telephone
computer
candle
paper
light bulb
carriage
mobile
phone
wheel
train
Trains can travel over very long distances.
a. 时间 b. 距离
Trains can also carry a lot of passengers.
a. 乘客 b. 人们
paper
With paper, we can learn and write easily. It is a practical invention.