单项选择题

Generally speaking, a man can tell ______ different odors.

A．five million
B．more than 10 000
C．fewer than 10 000
D．no more than 10 000
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单项选择题
According to the passage which of the following facts is NOT true
A．Many animals have poor eyesight while their sense of smell, is quite good.
B．Dogs are color blind.
C．The human sense of smell is not good.
D．Dogs can see no more than shades of gray.
单项选择题
The Alsatian's olfactory cells are ______ times as many as man's.
A．forty-four
B．one million
C．220 million
D．10 000
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