单项选择题

The purpose of this passage is to _________.

A．tell people about the astonishing rate of population growth '
B．urge people to start taking action right away
C．describe the problems the world will be faced with
D．give an account of the relationship between population growth and industry

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单项选择题

There is no point _________ the piano, unless you practice every day.

A．to learn to play
B．in learning to play
C．by learning to play
D．having learned to play

单项选择题

According to the passage, which of the following statements concerning Edison's electric light bulb is true

A．It replaced gas as a light source.
B．It increased the need for electric power.
C．It was safer than any other methods of lighting.
D．It could work only with electricity generated from coal.