Grasslandsneedtimetorecoverwhencattleandotheranimalsfee...

欄目: 練習題 / 發佈於: / 人氣:1.54W

問題詳情：

Grasslands need time to recover when cattle and other animals feed on them. Moving animals from one field to another can provide the 1 needed for new growth. This is called rotational grazing（輪流放牧）, and here’s more about how it 2 .

20090401

Rotational grazing is good for the land and the animals, and it can save money. This form of grazing can decrease the need for pesticides（殺蟲劑）by reducing the 3 of weeds. And it can 4 the need for chemical fertilizers by letting animal waste do the job of natural fertilizer. Rotational grazing can even help prevent wildfires by keeping 5 in good condition.

Letting animals feed constantly in the same grazing areas can require 6 replanting. Animals eat the most 7 growth first. When that keeps happening, the roots do not have enough time recover. 8 , less wanted plants may replace them. Heavily used grasslands are also harmed as the soil is 9 pressed down under the weight of heavy animals.

While rotational grazing can save money over time, it also requires 10 . And that starts with a good map to mark fences, water supplies and grazing areas.

1．A．cattle B．time C．space D．help

2．A．works B．happens C．does D．grows

3．A．cost B．size C．growth D．availability

4．A．spread B．meet C．dismiss D．limit

5．A．soil B．cattle C．grasslands D．weeds

6．A．costly B．unnecessary C．priceless D．immediate

7．A．rapid B．common C．necessary D．desirable

8．A．On the other hand B．In short

C．As a result D．In fact

9．A．surprisingly B．continually C．gently D．accidentally

10．A．training B．planning C．co – operation D．determination

【回答】