搜搜做题作业网根据课文填空,每空一 根据课文填空,每空一词. What are so
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根据课文填空,每空一
| 根据课文填空,每空一词. |
| What are some of the problems caused by chemical fertilizers?First,they damage the land l_____ killing the helpful bacteria and pests as well as the harmful ones.Chemicals also stay in the ground and underground water for a long time.This affects crops and,2_____,animals and humans,3_____ chemicals get inside the crops and cannot just be washed 4_____.These chemicals in the food supply build 5_____ in people's bodies over time.Many of these chemicals can lead 6_____ cancer or other illnesses.7_____ addition,fruit,vegetables and other food grown with chemical fertilizers usually grow 8_____ fast to be full of much nutrition.They may look beautiful,9_____ inside there is usually more water than vitamins and minerals. 10_____ these discoveries,some farmers and many customers are beginnng to tum to organic farming. Organic farming is simply farming 11_____ using any chemicals.They focus 12_____ keeping their soil rich and free of disease.A healthy soil reduces disease and helps crops grow strong and healthy.Organic farmers, therefore,often prefer using natural waste 13_____ animals as fertilizer.They feel that this makes the soil in their fields 14_____ in minerals and so more fertile.This also keeps the air,soil,water and crops 15_____ from chemicals. |
l.by 2.therefore 3.since 4.off 5.up 6.to 7.In 8.too 9.but
10.With 11.without 12.on 13.from 14.richer 15.free
10.With 11.without 12.on 13.from 14.richer 15.free