全新版大学英语视听阅读4答案0001.docx

1、全新版大学英语视听阅读4答案0001Unit 1 The Perfect Swarm Unit 2 The Red Devils Unit 3 The Orient ExpressUnit 4 The Varied Cultures of China Unit 5 Afghanistans Heroic ArtistsUnit 6 Natachas Animal Rescue Unit 7 Firewalking Unit 8 Living in the Slow LaneUnit 9 Alternative Energy Unit 10 Mars on Earth GlossaryUnit

2、1This story is set in the central and western U.S., particularly in the states of Texas, Oklahoma, Kansas, Nebraska, North and South Dakota, and Wyoming as well as the Rocky Mountains.In the 1800s, the Rocky Mountain locust brought massive destruction to Western settlers. Then, the insects suddenly

3、disappeared almost without a trace. Now scientists hope to find a reason for the locusts extinction. What caused the Rocky Mountain locust to disappear? Where will the scientists find the answers?I.Locusts! Read the paragraph. Then match each word with the correct definition.Many places in the world

4、 regularly experience plagues of locusts that can devastate entire countries. Locusts move in huge swarms, invade entire regions, and usually consume everything in their path. One swarm of locusts containing trillions of individual insects can eat thousandsof tons of vegetation a day. Locusts are on

5、e of the worlds most destructive insects, but they themselves are sometimes destroyed. In the 1800s, for example, the Rocky Mountain locust mysteriously became extinct.1.plague _E_2.locust _G_3.devastate _C_4.swarm _E_5.trillion _A 6.vegetation _F 7.extinct _B_A.1,000,000,000,000B.no longer in exist

6、enceC.cause extreme damageD.any widespread cause of misery, suffering, or deathE.a large group, usually of insectsF.the plant covering an areaG.an insect noted for flying in large groups and destroying cropsII.The Rocky Mountain Locust Mystery. Read the paragraph. Then complete the definitions with

7、the basic form of the underlined words or phrases.Dr. Jeff Lockwood is an entomologist who is particularly interested in the disappearanceof the Rocky Mountain locust. The species was mysteriously wiped out in the late 1800s and there arent many clues as to why it happened. By studying locust specim

8、ens under a microscope and by taking DNA samples from the dead locusts, Lockwood aims to find out why the Rocky Mountain locust suddenly disappeared from Earth.1.a thing or fact that helps provide an answer to a question; evidence: clue2.a person who studies insects: entomologist3.an item that is an

9、 example of a larger group: specimen4.destroy completely; cause to no longer exist: wipe out5.a scientific instrument that uses lenses to make small objects appear larger: microscope6.the material that carries the genetic information in the cells of each living thing: DNA SUMMARYThe mystery of the R

10、ocky Mountain locust has baffled scientists in North America for over 100 years. After locusts completely devastatedmany parts of the United States in 1875, the entire species vanished from the continent. Entomologist Jeff Lockwood is determined to solve this mystery. After traveling to the Rocky Mo

11、untains and studying locusts frozen in glaciers, Lockwood begins to look at the mystery from a new angle. Warming up Teaching NOTES1.Show students some pictures of locusts from the reading passage or other sources you can find.2.Have students guess why the locusts in this video and the reading passa

12、ge are called the perfect swarm.3.Ask questions like “ Have you ever seen a locust? ” and “ What do you know about locusts? GrasshopperThere are hundreds of species of grasshoppers.These insects belong to the suborder Caelifera in the order Orthoptera, and have antennae that are almost always shorte

13、r than their bodies, and short ovipositorsorgans for laying eggs. Normally females are larger than males. Males have a single unpaired plate at the end of the abdomen. The two pairs of valves (triangles) at the end of the female abdomen are used to dig in sand by the female grasshopper when laying e

14、ggs.Although they differ in many features, they are easily confused with another sub-order of Orthoptera, Ensifera. The main distinguishing elements are the number of segments in their antennae and structure of the ovipositor. The location of the tympana and modes of sound production are other disti

15、nguishing features. Ensiferans have antennae with at least 20 24 segments, and Caeliferans have fewer.ButterflyLike other holometabolous specieswith a complete metamorphosis where the immature insects are entirely different from the mature stages, butterflies life cycle goes through four stages: egg

16、, larva, pupa and adult. Their wings are large, often brightly colored, and they have conspicuous, fluttering flight.Butterflies comprise the true butterflies, the skippers and the moth-butterflies. The very many other families within the order Lepidoptera are considered moths. Some butterflies migr

17、ate over long distances. Some have formed symbiotic and parasitic relationships with social insects such as ants. Butterflies are important economically as agents of pollination. A few species are pests because they can damage agricultural crops or trees in their larval stages.Culturally, butterflie

18、s are featured in the visual and literary arts.DragonflyA dragonfly is an insect characterized by big multifaceted eyes, two pairs of strong transparent wings, and an elongated body. Dragonflies and damselflies are similar in appearance.They differ in the position of their wings which are held away

19、from, and perpendicular to, the body when at rest. Like any other insects, dragonflies possess six legs, but are not able to walk.Dragonflies usually eat flies, bees, ants, butterflies, and other small harmful insects, and are valuable as predators who help keep the equilibrium between beneficial in

20、sects and pests.They usually live around lakes, ponds, streams and wetlands because their larvae, known as “ nymphs” , are aquatic.CricketPartially related to grasshoppers, crickets are another group of insects with long antennae and flattened bodies. They have good vision and hearing. Their compoun

21、d eyes enable them to see in several directions simultaneously. A large number of crickets do not fly because their wings are not fully developed, but lie across the back. Their ability to jump to great heights compensates for the lack of flying skills. Crickets normally live less than one year. In

22、the spring, the nascent insect hatches and looks like the adult, except for the wings. Only after shedding the skin several times do crickets develop new wings.Although not all kinds of crickets are pests, some species such as the black field cricket can affect crops and gardens. They can also attac

23、k dwellings in autumn. The pale green tree cricket can destroy twigs and berry canes.In some cultures, it is said that crickets bring good luck. Some people believe that all those who are fortunate enough to hear their songs are blessed. If a cricket lives in the house, it is treated with respect. T

24、hey are placed in small cages and given food and water as the inhabitants of the house think that their existence brings good fortune.Watching video SCRIPT Narrator: Damage from swarms of locusts can reach disastrous proportions. A single swarm of desert locusts can consume over 70,000 metric tons o

25、f vegetation a day. There is, however, one continent that loscust-free: North America.Interestingly enough, this wasnat lways true. For hundreds of years, the Rocky Mountain locust was a common pest in the American West. Back in the mid-1800s, thousands of pioneers journeyed across the U.S. in searc

26、h of free land and new opportunities. They settled on the frontier of the western states, and began to farm the land intensively, growing corn and other crops.It camThen, in 1875, out of nowhere, a rare combination of air currents, drought, and basic biology produced the right conditions for an unth

27、inkable event, the worst storm ever recorded, the “ perfect swarm.horizon like a strange, dark cloud. Not millions, not billions, but trillions of insects, sweeping through the land like a living tornado. Those who saw the incredible event and survived never forgot what they witnessed.The swarm came

28、 together over the state of Texas, and soon moved quickly across the frontier in a huge destructive cloud that was nearly 3,000 kilometers long. The storm spread north towards North Dakota. The locusts eventually went as far west as the Rocky Mountains, leaving a path of devastation and destruction

29、wherever they went.An account from one person who observed the swarm described the locust storm. The locusts came downfrom the sky like hail. Frightened people ran screaming into their homes as the locusts claws dug intoand hung upon their clothing. They heard sharp cracks as the insects came underf

30、oot. The large locusts were everywhere, looking with hungry eyes turning this way and that. Their bodies blocked the sun, bringing darkness along with the destruction.Crop damages were absolutely astonishing. If such destruction were to happen today it would cost an estimated US$116 billion, more th

31、an the most costly hurricane in American history. And then, something remarkable happened: the Rocky Mountain locust simply vanished.At the University of Wyoming, entomologist Dr. Jeff Lockwood has spent over a decade investigating whythe Rocky Mountain locust disappeared.Dr. Jeff Lockwood, Universi

32、ty of Wyoming: “ There were probably more locusts in the largest swarm than thereare stars in the Milky Way trillions. Not only is something of that scale and magnitude and power gone, but it gone within a few years. It s not as if we had a tremendous series of earthquakes or tidal waves or forest fires.And so it doesn t make sense that it could ve gone extinct. There s no reason for it to have done so. Itmystery. ”Narrator: It as mystery that Lockwood is determined to solve. Whatever wiped out the Rocky Mountain locust