It should extend fifteen centimeters underground to keep rabbits from digging under it.

　　If snakes are a problem, remove dead trees and cut high grass to destroy their hiding places. And to protect livestock, consider using guard animals such as dogs and donkeys, which are very effective. Due to its effective work, ever since the Wildlife Services was started, it has been well received by farmers all over the States and neighboring countries such as Canada and Mexico.

　　1. The underlined phrase “unwelcome visitors” in the first paragraph refers to

　　________.

　　A. animals that attack the farmers

　　B. people who don't care about wildlife

　　C. animals that do harm to the crops or livestock

　　D. people who pollute the environment of the farms

　　2. It can be inferred from the second paragraph that ________.

　　A. the farmer didn't have a gun to kill those Canada geese

　　B. Wildlife Services involves some biologists in its group

　　C. the carrot crop was eaten up by the Canada geese

　　D. the farmers like to eat Canada geese very much

　　3. What is mainly discussed in the last paragraph?

　　A. Ways to protect livestock.

　　B. Ways to deal with coyotes.

　　C. How to protect crops.

　　D. How to find wildlife.

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