四六级

　　阅读向来是四级考生的复习重点，在日常练习中大家可以多吸取一些做题经验，也可以通过做练习题多总结答题技巧，下面小编为大家带来了一些英语四级阅读练习题，希望对大家有帮助！

　　Scattered around the globe are more than 100 smallregions of isolated volcanic activity known togeologists as hot spots. Unlike most of the world'svolcanoes. they are not always found at theboundaries of the great drifting plates that make upthe earth's surface; on the contrary, many of chemlie deep in the interior of a plate. Most of the hot spots move only slowly, and in some cases themovement of the plates past them has left trails of dead volcanoes. The bot spots and theirvolcanic trails are milestones that mark the passage of the plates.

　　That the plates are moving is now beyond dispute. Africa and South America. for example. aremoving away from each other as new material is injected into the sea floor between them. Thecomplementary coastlines and certain geological features that seem to span the ocean arereminders of where the two continents were once joined. The relative motion of the platescarrying these continents has been constructed in detail, but the motion of one plate withrespect to another cannot readily be translated into motion with respect to the earth’s interior. It is not possible to determine whether both continents are moving in opposite directions orwhether one continent is stationary and the other is drifting away from it. Hot spots. anchoredin the deeper layers of the earth, provide the measuring instruments needed to resolve thequestion. From an analysis of the hot-spot population it appears that the African plate isstationary and that it has not moved during the past 30 million years.

　　The significance of hot spots is not confined lo their role as a frame of reference. It nowappears that they also have an important influence on the geophysical processes chat propelthe plates across the globe. When a continental plate comes to rest over a hot spot. thematerial rising from deeper layer creates a broad dome. As the dome grows, it develops deepfissures (cracks); in at least a few cases the continent may break entirely along some of thesefissures, so that the hoc spot initiates the formation of a new ocean. Thus just as earliertheories have explained the mobility of the continents, so hot spots may explain theirmutability (inconstancy).

　　1.We can learn from che first paragraphthat_____________.

　　A. there are no volcanic activities on hoc spots

　　B. most hoc spots are located in the inner part of aplate

　　C. hot spots usually lie. at che boundaries of drifting plates;

　　D. the passage of plates through hot spots will leave dead volcanoes

　　2.The author believes that_____________.

　　A) the motion of the plates corresponds to thar of the earth's interior

　　B) the geological theory about drifting plates has been proved to be true

　　C) the hot spots and the plates move slowly in opposite directions

　　D) the movement of hot spots proves the continents are moving apart

　　3.That Africa and South America were once joined can be deduced from the factthat_________.

　　A) the two continents are still moving in opposite directions

　　B) they have been found to share certain geological features

　　C) the African plate has been stable for 30 million years

　　D) over 100 hot spots are scattered all around the globe

　　4.The hot spot theory may prove useful in explaining__________.

　　A) the structure of the African plates.

　　B) the revival of dead volcanoes.

　　C) the mobility of the continents.

　　D) the formation of new oceans.

　　5.The passage is mainly about______________.

　　A) the features of volcanic activities

　　B) the importance of the theory about drifting plates

　　C) the significance of hot spots in geophysical studies

　　D) the process of the formation of volcanoes

　　参考答案：

　　1.[B]根据题干直接查找到第1段。第2句第2个分句提到“其中很多位于板块内部的深处”，而表达同样含义的是B选项。该段第1句指出，这些互不相连、发生火山运动的小地区，地质学家称之为热点，可见A项错误。选项C与第2句第1个分句的内容相反。倒数第2句提到“在某些情形下，板块移动经过热点留下死火山的痕迹”，即不是所有板块移动都会留下死火山的痕迹，故D错。

　　2.[B]文章第2段的开头指出That the plates are moving is now beyond dispute。beyond dispute意为“毋庸置疑”，故答案选B项。从第2段第4句的“但是一个板块相对于另外一个板块的运动不能被顺理成章地解释成板块与它相对于地球内部的运动”，可排除A项。

　　3.[B]从第2段的第3句可知，非洲和南美洲曾经连接在一起的证据有两个——海岸线所具有的互补的特征(complementary coastlines)及某些地质特点(certain geological features)。B项符合后者，故为正确答案。

　　4.[D]关于hot spot theory的作用，除了第2段提到的参照作用外，第3段论及的另一个重要作用在于它能够推动扳块在地球表面漂移(propel the plates across the globe)，从而引发了新海洋的形成(initiates theformation of a new ocean)。故答案选D项。

　　5.[C]全文三个段落主要是围绕“热点对于地球物理学研究的意义”而展开的。故答案选C项。全篇共三段，第l段讲的是hot spots的定义与分布，第2段讲hot spots在大陆板块移动中的参照作用，第3段讲hot spots引起新海洋形成的地球物理意义。

　　以上就是小编为大家介绍的相关信息，希望对大家有帮助。想了解更多四六级备考课程、备考资讯，请点击文都网校四六级资讯站查询!有问题找文都☞☞☞详情咨询入口>>>

     编辑推荐