2、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 |
