B. develop

　　C. grow

　　D. ruin

　　答案: D

　　(2)

　　Animals perform many useful and amusing jobs. Dogs are particulary valuable in guiding the blind,

　　1

　　property, finding

　　2

　　people, and hunting criminals. Horses are used in guarding herds, carrying men in lands where there are no

　　roads,and helping farmers work their land. Pigeons

　　3

　　to

　　carry message. Wild animals from the jungles, forests and

　　seas are very popular performers in

　　4

　　and motion pictures. People realize that,

　　5

　　animals may not have the same intelligence as

　　6

　　, they are smart enough to learn

　　certain things. The first thing a dog is taught is to

　　7

　　. It should not

　　8

　　too long for him to learn commands. Simple orders, such as" sit, lie down, stay there, come here," can

　　9

　　be

　　taught by a child.

　　Training a dog to be a watchdog often produces unexpected results. Some dogs quickly learn the

　　difference

　　10

　　unwanted people and friends. This is

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