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[单选题]
We ___ eighteen lessons by the end of this term.A、have studiedB、had studiedC、will be st
A.have studied
B.had studied
C.will be studying
D.will have studied
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Prehistoric men and women enjoyed a more varied diet(饮食)than people do now, since they ate species(种类)of plant and several hundred thousand types of living things. But only a tiny percentage of these were ever domesticated(驯化). Modern shops have hastened a trend towards specialization which began in the earliest days of agriculture. The food of rich countries has become cheaper relative to wages. It is speedily distributed in supermarkets, but the choice annually becomes less and less great. Even individual foods themselves become more standardized. We live in the world of the carrot specially blunted in order to avoid making a hole in the bag, and the tomato grown to meet a demand for a standard weight of eighteen tomatoes to a kilo. Siri von Reis Altschul asks: "Only the tree major cereals(谷物)and perhaps ten other widely cultivated species stand between famine and survival for the world's human population and a handful of drug plants has served Western civilization for several thousand years. A rather obvious question arises: are we missing something？" After all, there are 800,000 species of plant on earth.
1. In prehistoric times people _____.
A. ate much more than we do today
B. lived mainly on plant food
C. had a wide-ranging diet
D. were more fussy about what they ate
2. Most of us have come to expect _____.
A. no variation in our diet
B. a reduction in food supplies
C. a specialist diet
D. food conforming to a set standard
3. The specialization of food was started by _____.
A. the emergence of supermarkets
B. the rise of agriculture
C. the rich countries
D. the modern shops
4. According to the passage, people in the West today survive on _____.
A. carrots and tomatoes
B. several thousand types of plants and cereals
C. a very small number of cultivated foods
D. special species planted one thousand years age
5. The conclusion seems to be that we _____.
A. could make use of more natural species
B. don't cultivate the right kind of food
C. produce more food than we need
D. cultivate too many different species
