D．doubts whether robots will be put into the market

　　解析：推理判断题。根据末段In fact some people have started collecting money in order to buy robots可推断，答案为A项。

　　答案：A

　　B

　　Americans love their dogs and treat them well.They take their dogs for walks，let them play outside and give them good food and medical care.However，dogs without owners to care for them lead a different kind of life.The expression，to lead a dog’s life，describes a person who has an unhappy existence.

　　Some people say we live in a dog­eat­dog world.That means many people are competing for the same things, like good jobs.They say that to be successful，a person has to work like a dog.This means they have to work very，very hard.Such hard work can make people dog­tired.And，the situation would be even worse if they became sick as a dog.

　　Still，people say every dog has its day.This means that every person enjoys a successful period during his or her life.To be successful，people often have to learn new skills.Some people are compared to dogs in bad ways.People who are unkind or uncaring can be described as meaner than a junkyard dog.Junkyard dogs live in places where people throw away things they do not want.Mean dogs are often used to guard this property.They bark or attack people who try to enter the property.However，sometimes a person who appears to be mean and threatening is really not so bad.We say his bark is worse than his bite.

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