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
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
According to the man, how do some bees use their sense of smell
A．To find their way back to the nest.
B．To locate plant fibers.
C．To identify kinds of honey.
D．To identify relatives.
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