单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

In the fields. B) At the market. C) In a plant garden. D) In a classroom.
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单项选择题
A．Because they were driven by steam power.B．Because they did the work that animals used to do.C．Because they pulled cars full of coal.D．Because they were made of iron.
A．Because they were driven by steam power.
B．Because they did the work that animals used to do.
C．Because they pulled cars full of coal.
D．Because they were made of iron.
填空题
Materials that are not permitted to be buried in land[ills should be dumped at ______.
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