Husbands and wives use the word “doghouse” when they are angry at each other.She might tell him that he is in the doghouse.She may not treat him nicely until he apologizes.However，the husband may decide that it is best to leave things alone and not create more problems.He might decide to let sleeping dogs lie.

　　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.

　　本文介绍了许多与狗有关的习语，这些习语在人们的日常生活中被广泛使用。

　　5．What is the passage mainly about?

　　A．Some expressions related to dogs.

　　B．The impact of dogs on people’s life.

　　C．People’s attitudes towards their dogs.

　　D．People’s concern about their dogs.

　　解析：主旨大意题。本文介绍了许多跟狗有关的习语，这些习语已经在人们的日常生活中被广泛使用，故答案为A项。

　　答案：A

　　6．Which of the following sentences describes a person who is facing fierce competition?

　　A．He is letting sleeping dogs lie.

　　B．He is leading a dog’s life nowadays.

　　C．He is living in a dog­eat­dog world.

　　D．He is making use of a mean dog.

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