题目

读下图，完成下列各题。 A B （1） 岩石A有明显的矿物晶体颗粒，按照岩石的形成原因分类，它应该属于岩，其形成原因是。 （2） 观察岩石A还可以发现，它还具有明显的或结构。 （3） 岩石B常有片状结构，若按照岩石的形成原因分类，它应该属于岩，其形成原因是。 答案：【1】岩浆【2】地下岩浆侵入地壳冷却凝固后形成的 【1】气孔【2】柱状 【1】变质【2】地壳中已生成的岩石，在岩浆活动、地壳运动产生的高温、高压条件下，原来岩石的成分和结构发生变化而形成新岩石。阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。We find different kinds of animals in the world. Some animals, such as tigers and lions， live in big forest and they are called animals. Some others like sheep and dogs are by men and they are called domestic（家养） animals. These animals are very different from one another，but we can them into big groups: those that eat other animals and those that eat grass and leaves. Animals like the belong to the first group. Animals are great use to human beings. Men wild animals for their fur and meat. Domestic animals are more important to men. Without them, life will be . People make use of animals in many ． Cows and pigs are useful to men's . They give 80％ of the men eat every year. Skin of some animals can be into expensive overcoats and shoes, which are warm and comfortable and a long time. They are very welcome in countries. Wool，which is now one of the most important materials for textile （纺织） ,comes from some certain . From cows, we get milk. And we shouldn’t that some domestic animals are kept for transport（运输）,Many people ride horses. Arabs（阿拉伯人） ride on camels that travel in deserts for days without .In some places animals are still used to plough field（犁田）． is clear that men just can’t live without these animals. 1.A．fighting B．serious C．terrible D．wild 2.A．trapped B．treated C．kept D．sold 3.A．Divide B．separate C．turn D．change4.A．tiger B．chicken C．dog D．goat 5.A．with B．of C．for D．to6.A．discover B．hunt C．raise D．care for7.A．quite B．very C．some D．even 8.A．difficult B．smooth C．easy D．perfect9.A．groups B．ways C．places D．kinds10.A．food B．work C．family D．behavior 11.A．meat B．meal C．dinner D．animal12.A．put B．turned C．changed D．made 13.A．cost B．last C．take D．dress14.A．cool B．foreign C．warm D．cold 15. A．industry B．workers C．business D．factory16.A．sheep B．animals C．cows D．goats 17.A．realize B．remember C．forget D．notice18.A．always B．hardly C．just D．still 19. A．drinking B．resting C．sleeping D．stopping20.A．That B．This C．So D．It