What can you infer from the passage？ 查看材料A.The expe

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A.Scientists engaged in the experiments

B.Investigations made by people

C.The resistant strain and the sensitive strain

D.The availability of the two strains

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A.quantities of salt consumed

B.choice of mating partner

C.blood pressure

D.reaction to salt

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A.Shared environmental factors can cause hypertension

B.Dietary salt can lead to high blood pressure in man and animals

C.Some rats not some individuals do not develop high blood pressure by consuming large amounts of salt

D.High blood pressure can be developed as a result of too much consumption of dietary salt

阅读材料，回答题。

High Blood Pressure

There is evidence that the usual variety of high blood pressure is，in part，a familial disease．Since families have similar genes as well as similar environment，familial diseases could be due to shared genetic influences，to shared environmental factors，or to both．For some years，the role of one environmental factor commonly shared by families，namely dietary salt，has been studied at Brook—haven National Laboratory．These studies suggest that chronic excess salt ingestion(摄取)can lead to high blood pressure in man and animals．Some individuals，however，and some rats consume large amounts of salt without developing high blood pressure．No matter how strictly all environmental factors were controlled in these experiments，some salt-fed animals never develop hypertension(高血压)whereas a few rapidly developed very severe hypertensions followed by early death．These marked variations were interpreted to result from differences in genetic constitution．

By mating in successive generations only those animals that failed to develop hypertension from salt ingestion，a resistant strain(the R strain)has been evolved in which consumPtion of large quantities of salt fails to influence the blood pressure significantly．In contrast，by mating only animals that quickly develop hypertension from salt，a sensitive strain(the S strain)has also been developed．

The availability of these two strains permits investigations not therefore possible．They provide a plausible laboratory model on which to investigate some clinical aspects of the human developing methods by which genetic susceptibility(敏感性)of human beings to high blood pressure can be defined without waiting for its appearance．

The main idea of this passage is__________． 查看材料

A.Genetic constitution，or hereditary factor is all important factor that may underlie hypertension

B.Excessive use of salt may cause high blood pressure

C.Shared environmental factors may lead to familial disease

D.There are two different kinds of strains in animals which cause their different reactions to excess salt ingestion

Rich countries intend to__________． 查看材料

A.offer poorer countries trade privileges

B.take away file trade privileges they have given poorer countries

C.clamp down counterfeiting in poorer countries

D.threaten the counterfeiting gangs in Philippines

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A.more jobs have to be created there for local people

B.rich countries resort to both persuasion and threats

C.the World Trade Organization was set up

D.the Uruguay round of world trade talks was held in l994

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A.critical

B.contradictory

C.positive

D.negative

阅读材料，回答题。

Counterfeit

Making and selling fake copies of well-known products has been a nice little earner for crafty craftsmen over thousands of years : In Roman Gaul, unscrupulous potters would put the seals of better-known competitors on their urns so they would sell better. Until the 1980s, counterfeiting was a relatively small-scale business restricted mainly to copying luxury fashion items, such as watches and leather goods, in limited quantities. But in the 1990s it was transformed into a much bigger, broader industry, with large-scale production and distribution of false versions of such everyday items as biscuits and shampoo. Modem technology is making it ever easier to create near-perfect copies of branded goods for a fraction of the retail price of the real thing.

By its nature, the extent of counterfeiting is hard to measure precisely, but a study by the International Chamber of Commerce reckonedthat it grew from perhaps 3 % of world trade in 1990 to 5 % in 1995.John Pepper, hairman of Proter & Gamble, a consumer-goods multinational, says it may now be 7% -9%, or over $ 450 billion a year.

In some developing countries, the authorities have had, at best, an ambivalent attitude towards the booming manufacture of fake goods in their midst. After all, it creates jobs for local people and, at first sight,appears only to hurt foreign firms. Thus the richer countries whose firms are the main victims have had to use a mixture of persuasion and threats to get poorer nations to crack down on the pirates. The Uruguay round of world trade talks, which ended in 1994, resulted in agreement on the Trade Related Aspects of intellectual Property Rights ( Trips ) , which obliges all mender countries of the World Trade Organization to impose penalties for counterfeiting and other breaches of intellectual property rights; to enforce their piracy laws adequately; and to heap firms inhibit trade in faked versions of their products.

Besides offering poorer countries trade privileges in return for a clampdown on counterfeiting, rich countries have tried convincing them that if they try harder to enforce intellectual property rights, they will win more foreign investment. But, realizing that persuasion is having little effect, they are also resorting to threats:On January 15th, America issued a warning to the Philippines, the world&39;s leading piracy centers, that they may have their trade privileges taken away unless they crack down harder on the counterfeiting gangs.

The first paragraph is written to tell us that__________. 查看材料

A.the history of counterfeiting is more than thousands of years

B.counterfeiting is an effective way to make more money

C.modem technology is responsible for the booming manufacture of fake goods

D.counterfeiting has become more and more rampant

料

A.in the development of air transportation

B.the earliest passenger flights were successfully operated

C.to make travel easy and pleasant for the passengers

D.to provide different services

E.the shortage of qualified pilots

F.traveling by air was very cheap

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A.in the development of air transportation

B.the earliest passenger flights were successfully operated

C.to make travel easy and pleasant for the passengers

D.to provide different services

E.the shortage of qualified pilots

F.traveling by air was very cheap