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  3. Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, f

Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, f

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问题     Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, for example, have poor eyesight and no color vision. They see only shades of gray. But the dog’s sense of smell is extraordinary,
    The kind of dog known as Alsatian has 220 million olfactory (嗅觉) cells. Man has five million. Scientists believe that the Alsatian is one million times better than man in finding out odors.
    The human sense of smell, however, is really quite good. The average human being can distinguish more than 10 000 different odors.
The word" odor" means a ______.
选项 A、thing
B、person
C、smell
D、color
答案C
解析 通过上文可知，Alsatian在嗅觉上好于人类，所以此处odor指味道。
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