根據(jù)課文填空，每空一詞。
     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
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U5

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