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Can animals be made ( 36 )(work) for us? Some scientists think that one day animals may ( 37 )(teach) to do a number of simple ( 38 )(job).They say that in a film or on TV we may see elephants, or monkeys, dogs, bears, or other animals ( 39 )(do) a lot of things. If you watch ( 40 )(careful),you may find that those animals are always given something to eat in return for doing them. The scientists say that many different animals may be taught to do a number of simple jobs ( 41 ) they know they will get something to eat in return.
Of course,( 42 )we all know, dogs can be used to guard a house, and elephants can be used to do some heavy jobs. And we can also teach animals ( 43 )(work) in factories. Apes(猿猴),for example, have been used in America to help make cars. Scientists believe that these large monkeys may ( 44 ) day get in crops and even ( 45 )(drive) trains.