单项选择题

What is the main purpose of this passage（）

A．To describe an experiment in which a Hydrapulper is used.
B．To introduce Hydrapulper, a new type of garbage disposer.
C．To tell what the writer thinks of the recycling of garbage.
D．To explain why garbage should be recycled in a new way.

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热门试题

单项选择题

A lot of cities are trying new ways to treat garbage mainly because （）

A．their environment is becoming more and more dirty
B．the traditional ways of treating wastes are not efficient
C．they are short of useful materials
D．they need new materials made from garbage

单项选择题

What is done to the waste that is useless when the new way is used（）

A．It is thrown away.
B．It is burnt.
C．It turns into some solid objects.
D．It is stored undergroun