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There is evidence that the usual variety of high blood pressure is, in part, a family dise

ase. Since families have similar genes as well as similar environment, family diseases could be due to shared genetic influences, to shared environmental factors, or to both. For some years, the role of one's environmental factor commonly shared by families, namely, dietary salt, has been studied at Brookhaven National Laboratory. These studies suggest that chronic excess salt ingestion 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 whereas a few rapidly developed very severe hypertension 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 ("S" strain) has also been developed.

The availability of these two strains permits investigations not heretofore possible. They provide a plausible laboratory model on which to investigate some clinical aspects of the human proto - types of hypertension. More important, there might be the possibility of developing methods by which genetic susceptibility of human beings to high blood pressure can be defined without waiting for its appearance.

Which statement relates the main idea of this passage？

A．When salt is added to their diets, rats and men react in much the same way.

B．The near future will see a cure for high blood pressure.

C．Modem research has shown that high blood pressure is a result of salt in the diet.

D．A tendency toward high blood pressure may be a hereditary factor.

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发布时间：2020-09-24

更多“There is evidence that the usual variety of high blood pressure is, in part, a family dise”相关的问题

第1题

According to paragraph 7，what is the result of the test on Choe's hypothesis？A．It shows th

According to paragraph 7，what is the result of the test on Choe's hypothesis？

A．It shows that his hypothesis is wrong．

B．It proves that his hypothesis is convincing．

C．It suggests that his hypothesis needs revising．

D．Not enough evidence has been found to support his hypothesis．

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第2题

回答（47）题查看材料A.Scholars differ in interpreting th

回答（47）题查看材料

A.Scholars differ in interpreting the purpose of the designs.

B.The largest picture may have been the sites for special ceremonies.

C.He called Nazca "the largest astronomy book in the world".

D.A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.

E.Other scientists are now searching for evidence to prove this.

F.Seen from the ground， it looks like lines scratched into the earth.

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第3题

回答（49）题查看材料A.Scholars differ in interpreting th

回答（49）题查看材料

A.Scholars differ in interpreting the purpose of the designs.

B.The largest picture may have been the sites for special ceremonies.

C.He called Nazca "the largest astronomy book in the world".

D.A Swiss writer named Erich von Daniken wrote that the Nazca lines were designed as a landing place for UFOs.

E.Other scientists are now searching for evidence to prove this.

F.Seen from the ground， it looks like lines scratched into the earth.

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第4题

根据材料请回答 51～65 We know the kiss as a form. of expressing affection.But long befo

根据材料请回答 51～65

We know the kiss as a form. of expressing affection.But long before it became 51 ,it was the custom in many parts of the world to use the kiss as a(n) 52 of respect.

In many African tribes the natives kiss the ground over which a chief has walked.Kissing the hand and foot has been a mark of respect form. the 53 times.

The early Romans kissed the mouth or eyes as a form. of dignified greeting.One Ro-man emperor allowed his important nobles to kiss his lips, but the 54 important ones had to kiss his hands, and the 55 important ones were only allowed to kiss his feet!

It is quite probable that the kiss as a form. of affection can be traced back to primitive times when a mother 56 fondle her child, just as a mother 57 today. It only remained for society to 58 this as a custom for expressing affection between adults.

We have evidence that this was already the 59 by the time of the sixth century, but we can only assume it was 60 long before that.The first 61 where the kiss became ac-cepted in courtship and love was in France.When dancing became popular, almost every dance figure ended 62 a kiss.

From France the kiss spread rapidly all over Europe.Russia, which loved to 63 the customs of France，adopted the kiss and it spread there through all the upper classes．A kiss from the Tsar became one of the highest forms of recognition from the Crown．

In time，the kiss became a part of courtship． 64 marriage customs developed，the kiss became a part of the wedding ceremony．Today，of course，we regard the kiss as ai expression of love and tenderness．But there are still many places in the world where th。kiss is 65 0f formal ceremonies and is intended to convey respect．

第 51 题

A．it

B．one

C．this

D．itself

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第5题

请根据短文内容，回答题。 Do You Have a Sense of Humor？Humor and laughter are good for us. Th

请根据短文内容，回答题。

Do You Have a Sense of Humor？

Humor and laughter are good for us. There is increasing evidence that they can heal us physically, mentally, emotionally, and spiritually. In fact, every system of the body responds to laughter in some positive, healing way. So how can we get more laughter into our lives？ __________(46) Psychologist and author, Steve Wilson, has some answers.＜br＞

Many people believe that we are born with a sense of humor. They think, "Either you&39;ve got it,or you don&39;t." Dr. Wilson points out that this is false.__________ (47)＜br＞

The parts of the brain and central nervous system that control laughing and smiling are mature at birth. __________(48) (After all, when a baby laughs, we don&39;t rush over and say, "That kid has a great sense of humor!") A sense of humor is something that you can develop over a lifetime.＜br＞

Sometimes people think that they don&39;t have a good sense of humor because they are not good joke tellers. Dr. Wilson reminds us that telling jokes is only one of many ways to express humor.＜br＞

__________ (49) Then we will make others laugh, too.＜br＞

A person who has a true sense of humor is willing and able to see the funny side of everyday life.＜br＞

One of the best definitions of a sense of humor is "the ability to see the nonserious element in a situation." Consider this sign from a store window. "Any faulty merchandise will be cheerfully replaced with merchandise of equal quality." The store manager probably placed the sign in the window to impress customers with the store&39;s excellent service. __________(50) As Dr. Wilson says,"A good sense of humor means that you don&39;t have to be funny, you just have to see what&39;s funny."

第46题__________ 查看材料

A.He advises us to lose our inhibitions （抑制） and try to laugh at ourselves

B.Is it possible to develop a sense of humor？

C.However， that does not mean that infants have a sense of humor

D.What is true， however， is that we are born with the capacity to laugh and smile

E.Everyone experiences this emotion

F.He had a serious purpose， but if you have a sense of humor， you will probably find the sign funny!

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第6题

There is () evidence to be sorted out.

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第7题

循证问题（evidence triggered)

循证问题(evidence triggered)

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第8题

Dear sir, Thank you for your kind letter of December 11, 2003. We are happy to know that o

Dear sir,

Thank you for your kind letter of December 11, 2003. We are happy to know that our paper entitled "Purification of Clostridium perfringens phospholipas C (@-toxin) by affinity chromatography on agarose-liked egg-yolk lipoprotein" (Art no. RPP-1265) will be acceptable. We have tried to shorten and revise the manuscript. in line with the suggestion made by one of the reviewers and yourself. I am enclosing duplicate copies of the revised version. In answer to the questions raised by the reviewer, we must admit that we have not tested for lipase activity known to exist in culture of this organism. However, since our purified phospholipase C was found homogeneous by various criteria, we believe contamination with lipase, if there is any, is likely to be slight. In any case, we will test for lipase activity as soon as possible.

As to the second question, we realized that the lipoprotein in affinity adsorbent was attacked by the enzyme to a small extent; a minute amount of phosphorycholine was always detected in the break-through peak. As reported, however, the same column can be repeatedly (at least four times) without losing its affinity for the enzyme.

We still do not know whether or not all of the multiple forms of enzyme are artifacts formed exclusively during isoeletric focusing. But some evidence is now available for the presence of at least two forms of enzyme, which are separable by methods other than isoeletric focusing, i. e. CM--or DEAE--Sephadex chromatography (unpublished data). The clarification of this question is now in progress in our laboratory.

We have accepted all the suggestions penciled in by the reviewer on the original manuscript; the abbreviation SDC has been avoided. Through these revision we have succeeded in shortening the manuscript. by two pages in total, although the page numbers have been kept unchanged. In the revised manuscript. we have put the reference numbers in the right order as requested. We would like, however, to keep the designation of the figures as it was, since we believe the suggestion may be based on a misunderstanding on the part of reviewers. As suggested, we have improved the description of the essential step involved in preparation of the affinity adsorbed (page 6,5th line from the bottom of the original manuscript) as follows; "by centrifuging the mixture at 13,000g for 15 min. to discard the precipitate." I hope that these revisions and the shortened text are satisfactory and that the revised version will be acceptable for publication in Biochimica et Biophysica Acta. I also hope the revised manuscript. will reach you before January 1.

Sincerely yours,

Nobuo Ogata, M.D.

The author wants his paper ______.

A．to be revised

B．to get a prize

C．to be published

D．to be looked through

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第9题

The evidence documents of force majeure should be issued by the local ______.

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