[解析]
(1)G.文章衔接题.根据前文People in the United States love their dogs and treat them well.可知美国的人们爱他们的狗,善待它们.G项:They take their dogs for walks,let them play outside and give them good food and medical care.他们带着狗出去散步,让它们在外面玩耍,给它们提供良好的食物和医疗保健.符合文意,故选G.
(2)F.语境辨析题.根据前文Some people say we live in a dog﹣eat﹣dog world.可知有些人说我们生活在一个"狗咬狗"的世界里.F项:That means many people are competing for the same things,like good jobs.这意味着许多人都在为同样的事情而竞争,比如好的工作.符合文意,故选F.
(3)B.联系下文题.根据后文This means that every person enjoys a successful period during his or her life.可知这意味着每个人在一生中都享有一个成功的时期.B项:Still,people say every dog has its day.尽管如此,人们还是说每只狗都有自己的一天.符合文意,故选B.
(4)C.段落理解题.根据后文People who are unkind or uncaring can be described as meaner than a junkyard dog.可知不友善或漠不关心的人可以被形容为比垃圾场的狗更卑鄙.C项:Some people are compared to dogs in bad days.有些人在糟糕的日子里被比作狗.符合文意,故选C.
(5)A.联系上文题.根据本段首句Dog expressions are also used to describe the weather.可知狗的表情也用来描述天气.A项:We do not want it to rain cats and dogs.我们不希望它下猫狗雨.符合文意,故选A.