英语填词Can animals be made to work for people?Some scientists t

英语填词
Can animals be made to work for people?Some scientists think that one day animals may be trained todo a number of simple j________instead of p________.They say that at a circus,for example,we may see elephants,m__________,dogs and other animals doing quite skillful things.Perhaps you have seen them on the television or in a f________If you watch closely,you may find that the t________always gives the animal some sugar or a piece of f__________as a reward.The scientists say that many d______animals may be trained to a lot of simple thing.If they know they will get a reward from doing that.
Of course,as we know,dog can be trained to look after a house,and soldiers in both old and m_______times have used geese to give warning by making a lot of n________when an enemy comes near.And also it may be p_________to train animals to work in families or factories.