Americans use many expressions with the word dog. People in the United States 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. 

Some people say we live in a dog-eat-dog 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 dog-tired. However, 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. 

Many dogs in the United States sleep in safe little houses near their owners’ home. These doghouses provide shelter. Yet they can be cold and lonely in the winter. Husbands and wives use this word doghouse when they are angry with each other. For example, a woman might get angry at her husband for coming home late or forgetting their wedding anniversary. She might tell him that he is in the doghouse. 

Dog expressions are also used to describe the weather. The dog days of summer are the hottest days of the year. A rainstorm may cool the weather. But we do not want it to rain too hard. We do not want it to rain cats and dogs.

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1.In the passage, a dog-eat-dog world means _________.

A people are fighting against dogs

B people are making food for their dogs

C people are competing for the same things, like good jobs

D people are taking their dogs for walks

解析：选C。细节理解题。依据文中第二段的Some people say we live in a dog-eat-dog world. That means many people are competing for the same things, like good jobs. 可知我们生活在一个竞争激烈的世界，故选C。

2.According to the passage, if a person wants to be successful, he or she must _________.

A enjoy his or her good job

B work like a dog

C let his or her dog play outside

D wait for a chance

解析：选B。细节理解题。依据文中第二段的They say that to be successful, a person has to work like a dog. 可知一个人想成功，就得拼命工作，故选B。

3.Husbands and wives use the word doghouse when ___________.

A they feel tired

B they feed their dog

C they are mad at each other

D are afraid of to see something

解析：选C。细节理解题。依据文中第三段的Husbands and wives use this word doghouse when they are angry with each other.可知夫妻之间彼此生气就会用doghouse这个字眼，故选C。

4.Which of the following dog expression describes the weather of the hottest days of the year?

A Every dog has its day.

B Such hard work can make people dog-tired.

C It rains cats and dogs in summer.

D They are the dog days of summer.

解析：选D。细节理解题。依据文中第四段的The dog days of summer are the hottest days of the year. 可知the dog days of summer 是一年中最热的三伏天，故选D。

5.According to the passage, which of the following is NOT TRUE?

A There are many dog expressions in England.

B People have to keep on learning new skills to the way of success.

C Many dogs in America sleep in their owners’ doghouse.

D In the passage, dog expression can not only describe a person but also the weather.

解析：选A。综合性判断题。依据文中Americans use many expressions with the word dog. 可判断A与原文不符；依据文中第二段的To be successful, people often have to learn new skills.可判断B与原文相符；依据文中第三段的Many dogs in the United States sleep in safe little houses near their owners’ home.可判断C与原文相符；通读全文就会判断D与原文相符。