单项选择题

How did the woman learn about the process she describes

A．She was doing research for a paper on it.
B．She read a newspaper article about it.
C．She was told about it by her roommate.
D．She heard about it in class.

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单项选择题

What does the woman mention as a disadvantage of the process she describes

A．It hasn't been fully tested.
B．It's quite expensive.
C．It uses up scarce minerals.
D．The gas it produces is harmful to the environment.

单项选择题

In the process described by the woman, why is the c0al burned

A．To produce a gas containing carbon and hydrogen.
B．To remove impurities from methanol.
C．To heat the reactors.
D．TO prevent dangerous gases from formin