题目内容

请结合给定资料反映出的主要问题，自选角度，自拟标题，写一篇议论文。
要求：观点鲜明，见解深刻，论证充分，条理清楚，语言顺畅，书写工整，总字数在800一1000字内。(50分)

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更多问题

When should the goods have been delivered？ The goods should have been delivered ______.

What animals also dream like human beings？
__________dream, too.

Animal perform. many useful and entertaining jobs. Dogs
are particular valuable in guiding the blind, protecting property, 【S1】.
finding lost people, and hunting criminals. Horses are used in
guarding herds, carrying men in lands where there are no roads,
and help farmers work their land. Pigeons have long been used 【S2】.
to carry messages. People realize that, although animals may
not have the same intelligence like human beings, they are 【S3】.
smart enough to learn certain things. Training a dog to be a
watchdog often produces unexpecting results. Some dogs 【S4】.
quickly learn the difference between unwanted people and
friend. This is because their masters welcome friends
and invite him into their houses. Some dogs will always attack 【S5】.
the postman who comes to deliver letters. One explanation for
this behavior. is that, although the postman comes to the houses
often, but he never enters the house. Therefore, the dog thinks 【S6】.
the postman is someone who is not wanted, but keeps coming
back anyway.
Masters of dogs who attack postmen can easy show the dog 【S7】.
that the postman is a friend and that the dog does not need to
treat him as an unwanted person. A dog is quite ready to do that 【S8】.
his master wishes. And a dog is always happy when he is praised
for understanding correctly.
Dogs can be taught to obey commands when the sound of a
word is connected to a certain act. Two important factors in 【S9】.
teaching a dog to obey commands are: using the same word each
time for the same act, and teaching only one act at a time. Dogs
can learn to not only sit, lie down, come, and staying in place 【S10】.
when their masters go away, but also to jump, carry, and fetch.
【S1】

根据说明中的描述，使用表3-11给出的状态名称，给出图3-24中S1～S4所对应的状态。