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Passage 2
Eating habits change from generation to generation.Before scientists learned about vitamins and other constituents of food,such as proteins and carbohydrates(碳水化合物)，people believed in eating large quantities of food and were not concerned so much about a balanced diet.A hearty eighteenth century meal could consist of as many as twenty courses and would probably knock out many of us today！The Romans were famous for their enormous feasts and insatiable appetites.
In the year 2020 people's eating habits may be just as surprising but in a very different sort of way.With a world-wide growth in population,food production will become exclusively mechanical and scientific.There may well be an end to food as we know it today.Meals,as we know them may become a thing of the past.Food constituents and vitamins may be taken in the form of capsules(胶囊)，tablets and pills.The thought of these highly artificial food constituents replacing present day foods may not be very attractive,but they may be the answer to food shortage and world famine.
5.()According to the passage,people in the eighteenth century .
A.were stronger
B.were richer
C.had better appetites
D.believed in eating more
6.()The word “enormous”in the first paragraph is closest in meaning to .
A.delicious
B.friendly
C.attractive
D.plenty
7.()Which of the following may be the best answer to food shortage and world famine？
A.The discovery of proteins and carbohydrates.
B.The production of artificial food constituents.
C.People's concern of a balanced diet.
D.The invention of capsules,tablets and pills.
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