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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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
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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