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 dogs 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