(2018·陕西省西安市质检)Americans use many expressions with the word “dog”．People in the United States love their dogs and treat them well. 1 However，if a person lives an unhappy life，they say that person leads a dog's life.
Some people say we live in a dog-eat-dog world. 2 They say that to be successful，a person has to work like a dog.This means they have to work very hard.This can make people dog-tired.And，the situation would be even worse if they became sick as a dog.
3 This means that every person enjoys a successful period during his or her life.To be successful，people often have to learn new skills.Yet，some people say that you can never teach an old dog new tricks. They believe that older people do not like to learn new things.
4 People who are unkind can be described as a junkyard dog.Junkyard dogs live in waste yards.They bark or attack people who try to approach their property.
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. 5 We do not want it to rain cats and dogs.
A．Still，people say every dog has its day.
B．But we do not want it to rain too hard.
C．Some people are compared to dogs in bad ways.
D．Dogs are their best friends and they are loyal to people.
E．There are many other expressions waiting for you to explore.
F. That means many people are competing for the same things.
G．They take their dogs for walks，and give them good food and medical care.
【语篇解读】 本文是一篇说明文，主要介绍了美国人使用许多关于“狗”这个词的表达及其具体例子。
1．G [空白前说美国人爱狗，善待它们，而G项说他们带着狗散步，给它们良好的食物和医疗照顾，是对上文的具体描述，符合逻辑，故选G。]
2．F [空白前说有些人认为我们生活在一个自相残杀的世界，而F项说这意味着许多人在竞争同样的东西，前后语义衔接，其中a dog-eat-dog world与competing for相呼应，故选F。]
3．A [空白后说这意味着每个人在各自的生活中都有一段成功的时期，而A项说尽管如此，人们还是认为人人皆有得意时，是对下文的概括，其中a successful period与every dog has its day相呼应，故选A。]
4．C [空白后说不友好的人可以被描述成一个垃圾狗，而C项说有些人在有些不好的方面被比作狗，前后逻辑一致，其中空白后是对此处的具体描述，且a junkyard dog为提示词，故选C。]
5．B [空白前说暴风雨可能使天气凉爽，而B项说但是我们不希望雨下得太大。前后形成转折，且rain too hard与rain cats and dogs相呼应，故选B。]
