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Grasslands need time to recover when cattle and other animals feed on them. Moving animals from one field to another can provide the   21   needed for new growth. This is called rotational grazing(轮流放牧), and here’s more about how it   22  .

Rotational grazing is good for the land and the animals, and it can save money. This farm of grazing can decrease the need for pesticides(杀虫剂) by reducing the  23   of weeds. And it can    24    the need for chemical fertilizers by letting animal waste do the job of natural fertilizer. Rotational grazing can even help prevent wildfires by keeping   25   in good condition.

Letting animals feed constantly in the same grazing areas can require   26   planting. Animals eat the most  27   growth first. When that keeps happening, the roots do not have enough time to recover.    28  , less wanted plants may replace them. Heavily used grassland are also harmed as the soil is   29   pressed down under the weight of heavy animals.

While rotational grazing can save money over time, it also requires   30 . And that starts with a good map to mark fences, water supplies and grazing areas.

21.A.cattle

B. time 

C. space

D. help

22.A.works

B. happens 

C. does

D. grows

23.A.cost

B. size

C. growth 

D. availability

24.A.spread

B. meet

C. dismiss 

D. limit

25.A.soil 

B. cattle 

C. grasslands

D. weeds

26.A.costly

B. unnecessary

C. priceless 

D. immediate

27. A. rapid

B. common 

C. necessary

D. desirable

28. A. On the other hand 

B. In short

C.As a result

D. In fact

29. A. surprisingly 

B. continually

C. gently 

D. accidentally

30. A. training 

B. planning

C.co-operation

D. determination

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