单项选择题

What is the writer doing in paragraph C

A．supporting other research
B．making a proposal
C．rejecting a common belief
D．describing limitations
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单项选择题
According to the introduction, we become aware of the importance of smell when
A．we discover a new smell.
B．we experience a powerful smell.
C．our ability to smell is damaged.
D．we are surrounded by odours.
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