单项选择题

What does the professor say the term stadium refers to

A．A place for making astronomical observations.
B．An instrument used for observing stars.
C．A unit of measurement.
D．The North Star.
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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.
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.
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