新概念英语第三册里第一课pumas are large为什么用复数形式?说动物种类不应该用单数吗?

新概念英语第三册里第一课pumas are large为什么用复数形式?说动物种类不应该用单数吗? 《新概念英语》（第三册）第一课《A Puma at Large》Pumas are large,cat-like animals which are found in America.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London,they were not taken ser 是新概念英语第三册上面第一单元的.选项我只写了我觉得比较混淆的.1.People said______the puma.A.to have seen B.they had seen2._____,it immediately ran away.A.On being observedB.Having been observed3.Pumas never attack a huma NO后加名词单数和名词复数的区别新概念第三册23课9行No creature has received more praise and abuse than the common garden snail.与第一课14行As no pumas had been reported missing from any zoo in the country...中no后分别跟 关于新概念第三册第一课的问题?有一句是 As no pumas had been reported missing from any zoo in the country,this one must have been in the possession of a private collector.对于肯定推测 have been 是死也不能改的吗? has 可 新概念英语第二册第三课主要内容 新概念英语第三册一共多少课? 新概念英语二册第一课 新概念英语第二册第一课译文 背诵新概念英语第三册 新概念英语第三册MP3 新概念英语第三册译文 新概念英语2,第三课 新概念英语第二册第三课练习答案有谁知道新概念英语练习C的答案, 新概念英语第二册第三课摘要写作答案 新概念英语第三册第八课摘要写作,summary writing 新概念英语第三册第3课作文怎么写 关于新概念英语第三册第一课的问题新概念3 第一课,有一句'a large cat' only five yards away from her.这里only five yards away from her.属于什么成分?另外away可不可以去掉?