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

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单项选择题
In ParA．3, the word track could best be replaced by which of the following（）

A. band
B. rails
C. path
D. sequence
单项选择题
For whom is the author probably writing this passage（）

A．Train engineers.
B．General audience.
C．Professors of statistics.
D．Young children.
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