Questions 27 — 32 Complete the summary using the list of words, A-L, below. Write the correct letter, A-L, in boxes 27-32 on your answer sheet
原文
Scientists have long known that the surface of the tongue is covered with taste buds: onion. Shaped bundles of cells that stand guard for digestive *Stem. Long before our modern world of supermarkets and restaurants, taste buds served as a crucial tool to maintain the daily existence of our ancestors. The bitter flavour of a wild almond told a prehistoric human foraging in African forests that the nut was poisonous, and they should spit it out. A sweet fruit, though, was safe to consume, and full of energy from carbohydrates. The presence of lions and other man-eating predators also added urgency to meal choices. 'If the thing didn't taste good, you might decide it's not worth it to out in the open and at risk,' says Steve Millet, a taste researcher at the University of Maryland School of Medicine.
Much of what we ‘taste' in everyday life is actually the work of our nose. The tongue can distinguish only basic flavour sensations-sweet, sour, bitter, salt and umami, the ‘savoury' taste of meat and cheese which indicates protein. Sour taste comes from acidic compounds. And, like bitter taste, it can be a sign to decomposing meat or vegetables. Unpleasant tartness in unripe fruits comes from too much citric acid. This is how a tree or shrub keeps hungry diners at bay until its seeds are mature enough to travel via the diner's digestive system- to a new home.
选项
Acooking
Bconsumption
Cenemies
Dsight
Esense
Fpredators
Gplanting
Hsmell
Ipests
Jdigestion
Kdecay
Lsurvival
第 27 题
For many years it has been understood that the human tongue is covered with taste buds. These first evolved as an aid to _____ , they acted as a warning that a food was dangerous, or a confirmation that it was good for ____ . For early humans, the gathering of food was made difficult by ____
正确答案：L
第 28 题
For many years it has been understood that the human tongue is covered with taste buds. These first evolved as an aid to ____ , they acted as a warning that a food was dangerous, or a confirmation that it was good for _____ . For early humans, the gathering of food was made difficult by ____
正确答案：B
第 29 题
For many years it has been understood that the human tongue is covered with taste buds. These first evolved as an aid to ____ , they acted as a warning that a food was dangerous, or a confirmation that it was good for ____ . For early humans, the gathering of food was made difficult by _____
正确答案：F
第 30 题
Because our tongues can only taste five different flavours, a lot of what we think we taste' is in fact conveyed by _____ . Sour and bitter tastes signal that food is in the process of ____ . However, over the centuries, people have come to like a sour taste, and in this ____ we are different from animals.
正确答案：H
第 31 题
Because our tongues can only taste five different flavours, a lot of what we think we taste' is in fact conveyed by ____ . Sour and bitter tastes signal that food is in the process of _____ . However, over the centuries, people have come to like a sour taste, and in this ____ we are different from animals.
正确答案：K
第 32 题
Because our tongues can only taste five different flavours, a lot of what we think we taste' is in fact conveyed by ____ . Sour and bitter tastes signal that food is in the process of ____ . However, over the centuries, people have come to like a sour taste, and in this _____ we are different from animals.