Rubbish,however, is only part of the problem of polluting our planet. The need TOProduce ever-increasing quantities of cheap food leads to a different kind ofpollution. Industrialized farming methods produce cheap meat products: beef,pork and chicken. The use of pesticides and fertilizers produces cheap grainand vegetables. The price we pay for cheap food may be already too high: MadCow Disease in cattle, salmonella in chicken and eggs, and listeria indairy products. And if you think you'll abandon meat and become a vegetarian, you have the choice of very expensiveorganically-grown vegetables or a steady diet of pesticides every time youthink you're eating fresh salads and vegetables, or just having an innocentglass of water!
请教老师：这一句 you have thechoice of very expensive organically-grown vegetables...= 假如加上will，即you WILLhave the choice of very expensive organically-grown vegetables...含义有什么不同？
原句是不是意味着客观事实，非常一定，而假如有了will意味着说话者的推断 - 有“可能“的意思，不那样确信？
这个if真实条件句章振邦称为whenever型真实条件句。这种条件句的从句和主句都表示习惯意义，即任何时候只须条件成立，主句的动作就会发生。主句可以用一般目前时，也可以用will do形式。这个will是表示习惯的will，其实也就是说话人对习惯性事件的推断。用一般目前时和will do, 句子意思差别不大。比如，If you heat water to 100 °C，it boils/will boil. 你说这二个句子意思有差异吗？要掌握举一反三，将来不要再问类似问题。另外，will表示推断，是说话人信心非常足的推断，仅次于must。这就是为何一般以后时用will do表示。一般以后时的will其实就是表示推断意义的情态动词will。
