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  3. We drink more milk, eat more cream, cheese, butter than ever before. To meet and profit by this【C1】______demand for milk, dairy

We drink more milk, eat more cream, cheese, butter than ever before. To meet and profit by this【C1】______demand for milk, dairy

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问题     We drink more milk, eat more cream, cheese, butter than ever before. To meet and profit by this【C1】______demand for milk, dairy farmers have increased the【C2】______of their herds, they have【C3】______their grasslands more skillfully and have improved the quality of their stock. The average【C4】______of a cow in 1938 was 560 gallons at each lactation(哺乳期). Today it is well【C5】______800 gallons.
    The【C6】______of food given to a milking cow is【C7】______according to its weight and its yield. Sufficient energy, protein, minerals and vitamins must be fed to【C8】______the cow in good health and to replace【C9】______it loses in milk. A【C10】______supply of drinking water is essential. A cow will drink at【C11】______ten gallons a day and a【C12】______milker in hot weather may need as【C13】______as twenty-five gallons.
    Cows are usually milked twice a day, early in the morning【C14】______in the late afternoon. Machine【C15】______is almost adopted everywhere now but the cowman still has most important tasks. He will【C16】______the animals quietly, be keen for any sign of disease, know each animal【C17】______an individual and record its yield【C18】______each milking.
    Milk gives the farmer a greater income【C19】______any other product but it demands his time and the investment of a great deal of【C20】______.
【C7】
选项 A、various
B、varying
C、varied
D、variant
答案C
解析 这里需用动词的过去分词，故用varied。
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