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

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

Why was the man worried at first

A．He couldn't decide on a topic for his paper.
B．He thought his paper was late.
C．He hadn't heard from his family in a while.
D．He thought the woman had been ill.