Farmers can start rotational grazing by removing animals from a pasture when the grass is eaten to less that five centimeters. The pasture is then kept empty until the grass grows to more than fifteen centimeters high.

　　Sheep and goats may require special preparations. They may need stronger fences than other animals. And while they eat the grass, they may need guard animals to protect them from animals that would like to eat them.

　　67. Grasslands won't depend on chemical fertilizers when __________________.

　　A. the soil of grasslands is naturally rich

　　B. animal wastes serve as natural fertilizer

　　C. rotational grazing can prevent wildfires

　　D. grasslands are usually in good condition

　　68. The function of putting up electric fences is to _____________.

　　A. divide the pasture into paddocks

　　B. encourage animals to get around

　　C. stop animals staying at one place

　　D. provide water supplies for animals

　　69. Why do sheep and goats need guard animals?

　　A. They can easily jump over fences.

　　B. They don't like to stay in the paddock

　　C. wild animals are likely to attack them

　　D. Tigers and lions prefer sheep and goats

　　70. What would be the best title for the passage?

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