I choose D first, but now I switch the answer to E :
Ordinary seed planted 100 acre ,use 300 units of insecticide per acre= need to use 30,000 units insecticide àexceptionally large Use modified seed: Modified seed planted 100 acre, use 299 units of insecticide per acre=need to use 29,900 units insecticideàexceptionally large, too But see, (30,000-29,900)=100units insecticideà Planting modified seed save 100 units insecticideà the more large quantities of insecticide needed before, the more saving from using modified seed. àcover the cost from using modified seed and benefit the farmer.
About D: If the modified speed planted 100 acre and use 300 insecticide per acreà need to use 30,000 units insecticide If the modified speed planted 100 acre and use 299 insecticide per acreà need to use 29,900 units insecticide So far, the argument is the same as the above. Lets look at the opposite situation, (D 選項取非) If the modified speed planted different acres of cotton from farmers using the ordinary seed, For example If the modified speed planted 100 acre and use 300 insecticide per acreà need to use 30,000 units insecticide If the modified speed planted 50 acre and use 299 insecticide per acreà need to use 14,950 units insecticide You may think that the farmer save (30,000-14,950)=15,050 of insecticide used. But, notice , the yield of the crops is different, so the comparison is invalid. |