题目

最近，长江江豚“升格”为独立物种，它与白鳍豚、中华鲟、扬子鳄均属长江流域的珍稀物种。某同学根据图中动物的特征编制了如下检索表。 检索表 1a有四肢 甲 1b无四肢 2 2a尾鳍竖立乙 2b尾鳍水平3 3a ① 白鳍豚 3b ② 长江江豚 甲是，①处填写内容是。 答案：【1】扬子鳄【2】嘴狭长（或“吻狭长”) What is language for? Some people seem to think it's for practicing grammar_____and learning words. That's wrong. Language is _____communication.The way to learn a language_______to practice speaking it as often as possible. A great man once said _______is necessary to practice as much as possible. And______you use it, the better you speak.Learning languages takes a lot of time. But don't ________. Relax! Believe yourself. Learning foreign languages should be fun. Rome wasn't built in a day.Use a______. Keep a small English dictionary with you at all time. When you see a new word, look it up. It can help you. __________ the word—use it, in your hand, in a sentence.Try to think in English. When you see something, think of the English word, ________think about the word in a sentence.Learn more about the_______behind the language. When you understand it, you can use the language better.【1】A.rulesB.rolesC.racesD.reporters【2】A.ofB.fromC.inD.for【3】A.amB.isC.areD.be【4】A.thisB.thatC.theyD.it【5】A.the moreB.the fewerC.the lessD.the much【6】A.take upB.put upC.give upD.turn up【7】A.pencilB.dictionaryC.cameraD.phone【8】A.Know aboutB.Worry aboutC.Think aboutD.Look about【9】A.howeverB.untilC.thenD.although【10】A.symbolB.businessC.importanceD.culture