Questions 66-70
Your dog’s tongue is his stomach’s gatekeeper. By recognizing some foods as yumand others as yuck, it encourages him to eat high-calorie foods and discourageshim from ____ down poison. If you ____ in your dog’s mouth (and yours too)you’ll see lots of small bumps called papillae, each of which contains clusters oftaste buds. Each taste bud contains about 50 taste-receptor cells. Dogs have ____taste buds than we do—about 1,700 in the average dog compared to 9,000 in us.Taste buds in different parts of the tongue respond to different microscopicmolecules. Like us, dogs can identify sweet, sour, salty, and bitter. Unlike us, theyalso have special taste buds aimed at tasting only water. So for dogs, water isprobably not “tasteless,” as we usually describe it. These water receptors arelocated at the tip of the tongue—the part the dog dips in the water and curls underwhen ____. In people, the tip of the tongue is most sensitive to sweet tastes, whichis why you like to roll candy around your tongue’s tip. In dogs, the rear of thetongue is most sensitive to sweets. That may be why they seem to gulp them down.Dogs also have taste buds in the back of their throat, ___ they can actually tastethat food they seem to inhale without chewing!
【題組】66.
(A) scarfed
(B) scarfs
(C) scarf
(D) scarfing