单项选择题

Why does the man mention his friend Brian

A．To introduce the woman to someone who has researched blushing.
B．To illustrate the benefits of a public-speaking class.
C．To give an example of someone who blushes easily.
D．To explain a way to overcome blushing.
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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.
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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