【正确答案】 B

【答案解析】本题为细节推断题。在第三段中提到“Because it takes 4 kilos of grain protein to produce half a kilo Of meat protein…Therefore，it will also be necessary to change eating habits…”(因为，制造 0.5 千克肉类蛋白质需要 4 千克谷物蛋白质……于是，也有必要改变饮食习惯……)第四段中提到 “The soybean plant produces beans which have a very high fat and protein content…Possibly，we are all going to eat soybeans in the future and finally give up meat completely from our tables．”(大豆的果实中脂肪和蛋白质含量都很高……也许，我们以后都要吃大豆，最终使肉类从我们的餐桌上消失。)由此可见，人们想用大豆代替肉，是因为大豆富含脂肪和蛋白质，而生产肉需要大量的植物蛋白质。