Who have the keener sense of smell, dogs or humans? Most of us would ___21___ the dog's nose is much more sensitive than man's. After all, dogs are used to ___22___ criminals, and the police sometimes use dog to smell out drugs.
The ___23___ is that your nose is probably as sensitive as any dog's-___24___ you were trained to use your nose ___25___. And since your brain is much better than the dog's, you would be much ___26___ to fool than a dog would be. However, if you wanted to ___27___ someone's smell, you would have to crawl（爬行）about ___28___ your hands and knees with your nose to the ____29__ as the dog does．
In its own way, however, your nose is as sensitive to ___30___ smells as your ear is to the softest of sounds. Most wine companies employ professional tasters who ___31___ the quality of their products. These tasters take very small amounts of the ___32___, and roll it around in their mouths while ___33___ chewing movements. This“mouthing" of the liquid forces the air up the back entrance to the nasal cavity（鼻腔）toward the olfactory membrane（嗅觉粘膜），a place ___34___ smells can best be caught． If the wine suits their taste (actually,if it suits their smell),they may nod ___35___.
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