Organic food grown with natural fertilizers may be less expensive than those foods not utilizing natural fertilizers.

Fertilizers contain nutrients that are essential to plant growth. List the three nutrients that appear on the label of fertilizers:______ ______ ______

Natural foods also ________ vegetables not nourished by chemical fertilizers.

48. The quantity of farm foods is related to the use of chemicals and fertilizers.（ ）

43. According to the author, the use of chemicals and fertilizers ______.

The purpose of using chemicals and fertilizers is to increase the quality of foods.

Soil bacteria are integral to healthy soil for plants to grow without the use of chemical fertilizers.

1. Natural foods are rich inessential ____①____and ___②___.2. The use of chemicals and fertilizers is to increase the __③_not the _④___of foods.

Natural food also ________vegetables not nourished by chemical fertilizers. A: remove B: have C: contain D: include

6. Natural foods also ________ vegetables not nourished by chemical fertilizers. A: remove B: have C: contain D: include