补全对话

第5部分：补全短文（第46～50题，每题2分，共10分）下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。

1Toads are Arthritis and in PainArthritis(关节炎) is an illness that can cause pain and swelling in your bones. Toads (蟾蜍), a big problem in the north of Australia, are suffering from painful arthritis in their legs and backbone, a new study has shown. The toads that jump the fastest are more likely to be larger and to have longer legs._______(46)The large yellow toads, native to South and Central America, were introduced into the north-eastern Australian state of Queensland in 1935 in an attempt to stop beetles and other insects from destroying sugarcane crops. Now up to 200 million of the poisonous toads exist in the country, and they are rapidly spreading through the state of Northern Territory at a rate of up to 60 km a year. The toads can now be found across more than one million square kilometres._______(47) A Venezuelan poison virus was tried in the 1990s but had to be abandoned after it was found to also kill native frog species.The toads have severely affected ecosystems in Australia. Animals, and sometimes pets, that eat the toads die immediately from their poison, and the toads themselves eat anything they can fit inside their mouth._______(48)A co-author of the new study, Rick Shine, a professor at the University of Sydney, says that little attention has been given to the problems that toads face. Rick and his colleagues studied nearly 500 toads from Queensland and the Northern Territory and found that those in the latter state were very different. They were active, sprinting down roads and breeding quickly.According to the results of the study, the fastest toads travel nearly one kilometre a night._______(49) But speed and strength come at a price —arthritis of the legs and backbone due to constant pressure placed on them.In laboratory tests, the researchers found that after about 15 minutes of hopping, arthritic toads would travel less distance with each hop (跳跃)._______(50) These toads are so programmed to move, apparently, that even when in pain the toads travelled as fast and as far as the healthy ones, continuing their constant march across the landscape.A. Toads are not built to be road runners—— they are built to sit around ponds and wet areas.B. The task now facing the country is how to remove the toads.C. Furthermore, they soon take over the natural habitats of Australia’s native species.D. Toads with longer legs move faster and travel longer distances while the others are being left behind.E. But this advantage also has a big drawback —up to 10% of the biggest toads suffer from arthritis.F. But arthritis didn’t slow down toads outside the laboratory the research found.2Development in Newspaper Organizationone of the most important developments in newspaper organization during the first part of the twentieth century ______（1）_______，which are known as wire services. wire-service companies employed reporters，who covered stories all over the world. their news reports were sent to papers throughout the country by telegraph. the papers paid an annual fee for this service. wire services continue _______（2）________. today the major wire services are the associated press （ap）and united press international （upi）。

you will frequently find ap or upi at the beginning of a news story.newspaper chains and mergers began to appear in the early 1900s. a chain consists of two or more newspapers _______（3）______. a merger involves combining two or more papers into one. during the nineteenth century many cities had more than one competitive independent paper. today in most cities there are only one or two newspapers，and _______（4）______. often newspapers in several cities belong to one chain. papers have combined ________（5）_______. chains and mergers have cut down production costs and brought the advantages of big-business methods to the newspaper industry.a. to play an important role in newspaper operationsb. was the growth of telegraph servicesc. and they usually enjoy great prestiged. they are usually operated by a single ownere. in order to survive under the pressure of rising costsf. owned by a single person or organization3The Importance of Agriculture in Chinathe development of agriculture and the balance between food and population are china’s fundamental economic problems. the classical histories praise emperors for devotion to agriculture and much of china’s modern history is ____（1）____，which has been growing steadily.today，although agriculture accounts for only a quarter of the gross national product，it is still the main determinant of the standard of living and the principal occupation of at least 70 percent of population.agriculture also _____（2）____ because industry needs both agricultural raw materials and food for its work force. the failure of agriculture to supply raw material and food halted and later reversed the industrial progress of the 1950’s，after 1960 new emphasis was placed on agriculture，and the slogan “agriculture is the foundation of the economy”has remained a central chinese economic policy ever since.___（3）___，there is an indirect link due to the relationship between agriculture and foreign trade. many of china’s exports are ___（4）___ or consumer goods based on them. flourishing agriculture，therefore，promotes exports. it also reduces the need to spend foreign exchange on imports of grain and cotton，therefore __（5）___.a determines the progress of industryb the story of the unfolding struggle to feed a peasant populationc either agricultural raw materialsd enlarging the capacity of the economy to import machinery and commodities for industrye in addition to the direct links between agriculture and industryf thus promoting both import and export4supermarketsupermarket is a type of retailing institution that has a moderately broad product assortment spanning groceries and some nonfood lines，that ordinarily emphasizes price in either an offensive or defensive way. as a method，supermarket retailing features several related product lines， a high degree of self-service，largely centralized checkout，and competitive prices. the supermarket approach to retailing is used to sell various kinds of merchandise，____（1）____.the term supermarket usually refers to an institution in the grocery retailing field. most supermarkets emphasize price. some use price offensively by featuring low prices in order to attract customers. other supermarkets use price more defensively by relying on leader pricing to avoid a price disadvantage. since supermarkets typically have very thin gross margins，they need high levels of inventory turnover to achieve satisfactory returns on invested capital.supermarkets originates in the early 1930s. they were established by independents ____（2）____. supermarkets were an immediate success，and the innovation was soon adopted by chain stores. in recent decades supermarkets have added various nonfood lines to provide customers with one-stop shopping convenience and to improve overall gross margins.today stores using the supermarket method of retailing are dominant in grocery retailing. however，different names are used to distinguish these institutions ____（3）____：a superstore is a larger version of the supermarket. it offers more grocery and nonfood items ____（4）____. many supermarket chains are emphasizing superstores in their new construction.combination stores are usually even larger than superstore. they，too，offer more groceries and nonfoods than a supermarket but also most product lines found in a large drugstore. some combination stores are joint ventures between supermarkets and drug chains such as kroger and sav-on.for many years the supermarket has been under attack from numerous competitors. for example， a grocery shopper can choose among not only many brands of supermarkets but also various types of institutions （warehouse stores，gourmet shops，meat and fish markets，and convenience stores）。