2023年英语六级冲刺阅读训练及答案篇.doc
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1、一The Earth comprises three principal layers: the dense, iron-rich core, the mantle made of silicate (硅酸盐) that are semi-molten at depth, and the thin, solid-surface crust There are two kinds of crust, a lower and denser oceanic crust and an upper,lighter continental crust found over only about 40 pe
2、rcent of the Earths surface. The rocks of the crust are of very different ages. Some continental rocks are over 3,000 million years old, while those of the ocean floor are less than 200 million years old. The crusts and the top, solid part of the mantle, totaling about 70 to 100 kilometers in thickn
3、ess, at present appear to consist of about 15 rigid plates, 7 of which are very large. These plates move over the semi-molten lower mantleto produce all of the major topographical(地形学)features of the Earth. Active zones where intense deformation occur are confined to the narrow, interconnecting boun
4、daries of contact of the plates.There are three main types of zones of contact: spreading contacts where plates move apart, converging contacts where plates move towards each other, and transform contacts where plates slide past each other. Newoceanic crust is formed along one or more margins of eac
5、h plate by material issuing from deeper layers of the Earth s crust, for example, by volcanic eruptions (爆发) of lava (火山熔岩) at mid-ocean ridges. If at such a spreading contact the two plates support continents,a rift(裂缝) is formed that will gradually widen and become flooded by the tea. The Atlantic
6、 Ocean formed like this as the American and Afro-European plates moved in opposite directions. When two plates carrying continents collide, the continental blocks,too light to be drawn down, continue to float and therefore buckle (起褶皱) to form a mountain chain along the length of the margin of the p
7、lates.练习题:Choose correct answers to the question:1.The Earths crust_.A.can be classified into two typesB.is formed along the margins of the platesC.consists of semi-molten rocksD.is about 70 to 100 kilometers thick2.The 15 plates of the Earth are formed from _.A.the oceanic crusts and continental cr
8、ustsB.the crusts and the mantleC.the crusts and the top and solid part of the mantleD.the continental crusts and the solid part of the mantle3.Seriously-deformed zones appear _A.whenever the crusts move over mantleB.when the plates move towards each otherC.in the narrow boundaries where two plates m
9、eetD.to be the major topographical feature of the Earth4.According to the second paragraph, the formation of the Atlantic Ocean is the example of_.A.spreading contactsB.the influence of volcanic eruptionsC.converging contactsD.transform contacts5.This passage is probably_.A.a newspaper advertisement
10、B.a chapter of a novelC.an excerpt from a textbookD.a scientific report of new findings二A remarkable variety of insects live in this planet More species of insects exist than all other animal species together. Insects have survived on earth for more than 300 million years, and may possess the abilit
11、y to survive for millions more.Insects can be found almost everywhere - on the highest mountains and on the bottom of rushing streams, in the cold South Pole and in bubbling hot springs. They dig through the ground, jump and sing in the trees,and run and dance in the air. They come in many different
12、 colors and various shapes. Insects are extremely useful to humans, pollinating (授粉)our crops as well as flowers in meadows, forests, deserts and other areas. But licks and some insects, such as mosquitoes and fleas, can transmit disease.There are many reasons why insects are so successful at surviv
13、ing. Their amazing ability to adapt permits them to live in extreme ranges of temperatures and environments. The one place they have not yet been found to any major extent is in the open oceans. Insects can survive on a wide range, of natural and artificial foodspaint, pepper, glue, books, grain, co
14、tton,other insects, plants and animals Because they are small they can hide in tiny spaces.A strong, hard but flexible shell covers their soft organs and is resistant to chemicals, water and physical impact. Their wings give them the option of flying away from dangerous situations or toward food or
15、males. Also, insects have an enormous reproductive capacity: An African ant queen can lay as many as 43,000 eggs a day.Another reason for their success is the strategy of protective color. An insect may be right before our eyes, but nearly invisible because it is cleverly disguised like a green leaf
16、, lump of brown soil, gray lichen (青苔),a seed or some other natural object Some insects use bright, bold colors to send warning signals that they taste bad,sting or are poison.Others have wing patterns that look like the eyes of a huge predator, bitter-tasting insects; hungry enemies are fooled into
17、 avoiding them.练习题:Choose correct answers to the question:1.Insects can be found in large amounts in the following places EXCEPT _.A.on the mountains with little airB.in the cold polar areasC.in the hot desert areasD.in the open oceans2.Insects protect themselves from chemicals by _A.hiding in tiny
18、spacesB.having a strong shellC.flying away when necessaryD.changing colors or shapes3.Some insects disguise like natural objects so as to _A.frighten away their enemiesB.avoid being discoveredC.send warning signalsD.look bitter-tasting4.The passage mentions that insects _.A.can be found in any extre
19、me environmentsB.have survived longer than any other creaturesC.can be fed on any natural or man-made foodsD.are important for the growth of crops and flowers5.The passage is mainly about _A.how insects survive in different placesB.why insects can survive so successfullyC.what insects can do to the
20、environmentD.where insects can be found in quantity三The fridge is considered necessary. It has been so since the 1960s when packaged food list appeared with the label: Store in the refrigerator.In my fridge less Fifties childhood, 1 was fed well and healthy. The milkman came every day, the grocer, t
21、he butcher (肉商), the baker, and the ice-cream man delivered two or three times each week. The Sunday meat would last until Wednesday and surplus(剩余) bread and milk became all kinds of cakes. Nothing was wasted, and we were never troubled by rotten food. Thirty years on food deliveries have ceased, f
22、resh vegetables are almost unobtainable in the country.The invention of the fridge contributed comparatively little to the art of food preservation. Many well-tried techniques already existed - natural cooling, drying, smoking, salting, sugaring, bottling.What refrigeration did promote was marketing
23、 - marketing hardware and electricity, marketing soft drinks, marketing dead bodies of animals around the world in search of a good price.Consequently, most of the worlds fridges are to be found, not in the tropics where they might prove useful, but in the rich countries with mild temperatures where
24、 they are climatically almost unnecessary. Every winter, millions of fridges hum away continuously, and at vast expense, busily maintaining an artificially-cooled space inside an artificially-heated house - while outside, nature provides the desired temperature free of charge.The fridges effect upon
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- 2023 英语六级 冲刺 阅读 训练 答案
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