The _____ of blood always makes him feel sick.

A.“blood pain”

B.[blood pain]

C.blood pain[tw]

D.blood-pain

E.blood pain*

A.a single type of multipotent stem cell found in the bone marrow

B.differentiated cells that first developed in the fetal liver, but now reside in the bone marrow

C.division of differentiated cell types while circulating in the blood

D.stem cells that became committed to each specific blood celll type during embryonic development

ind if the right dose is being given.

A.血液浓缩剂

B.血液提纯剂

C.血液稀释剂

D.血液萃取剂

Eating too much fat can ___________ heart disease and cause high blood pressure.

A) attribute to B) attend to C) contribute to D) devote to

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.

day protects against heart attacks, moderate alcohol consumption wards off strokes, a new study found.

The study also found that the type of alcohol consumed -- beer, wine or liqour -- was unimportant. Any of them, or a combination, was protective, researchers reported in today's Journal of the American Medical Association. "No study has shown benefit in recommending alcohol consumption to those who do not drink", cautioned the authors, led by Dr. Ralph L. Sacco of Columbia University College of Physicians and Surgeons in New York. But the new data support the guidelines of the National Stroke Association, which say moderate drinkers may protect themselves from strokes by continuing to consume alcohol, the authors said.

The protective effect of moderate drinking against heart attacks is well established, but the data has been conflicting about alcohol and strokes, the authors said. The new study helps settle the question and is the first to find blacks and Hispanics benefit as well as whites, according to the authors. Further research is needed among other groups, such as Asian, whom past studies suggest may get no stroke protection from alcohol or may even be put at greater risk.

Among groups where the protective effect exists, its mechanism appears to differ from the protective effect against heart attacks, which occurs through boosts in levels of so-called "good" cholesterol, the authors said. They speculated alcohol may protect against stroke by acting on some other blood trait, such as the tendency of blood platelets to clump, which is key in forming the blood trait, such as the tendency of blood platelets to clump, which is key in forming the blood clots that can cause strikes.

The researchers studied 677 New York residents who lived in the northern part of Manhattan and had strokes between July 1,1993, and June, 1997. After taking into account differences in other factors that could affect stroke risk, such as high blood pressure, the researchers estimated that subjects who consumed up to two alcoholic drinks daily were only half as likely to have suffered clot-type strokes as nondrinkers. Clot-type strokes account for 80 percent of all strokes, a leading cause of US deaths and disability. Stroke risk increased with heavier drinking. At seven drinks per day, risk was almost triple that of moderate drinkers.

An expert spokesman for the American Heart Association, who was not involved in the study, said it was well-done and important information. But it shouldn't be interpreted to mean, "I can have two drinks and therefore not worry about my high blood pressure or worry about my cholesterol," said Dr. Edgar J. Kenton, an associate professor of clinical neurology at Thomas Jefferson University Medical College in Philadelphia. Instead, he said, the study provides good reason to do further research and to add alcohol to the list of modifiable risk factors for stroke.

The new study conducted by Dr. Sacco and his colleagues is unique in that ______.

A．it refutes early studies on the protective effect of moderate drinking against heart attack

B．it confirms early studies of moderate drinking against heart attacks

C．it helps to resolve the disputes over the effect of moderate drinking against stroke

D．it finds that moderate drinking can benefit people of different races equally well

hotography can bring out your creative side.Yoga engages your entire body and develops your strength,coordination and flexibility.Cooking can unleash your flair for flavor and give you a gratifying experience.Music as a hobby provides one way to express your artistic side and it allows you to share the pleasure with others and alleviate stress,anxiety and even lower blood pressure.

(机车).Indeed，the animal body is a machine.It is a machine composed of many parts doing some particular kind of work for which a particular kind of structure fits it.

All the parts are dependent on each other and work together for the accomplishment of the total business of the machine.The locomotive must be provided with fuel, such as coal or wood or other combustible(易燃的)substance，the consumption of which provides the force or energy of the machine.The animal body must be provided with fuel, which is called food, which similarly provides the energy of the animal.

Oxygen must be provided for the combustion of the fuel in the locomotive and of the food in the body.The locomotive is composed of special parts，the fire box for the storage and combustion (燃烧)of fuel; the steam pipes for the carriage of steam; the wheels for locomotion (移动); the chimney for throwing off waste.

The animal body is similarly composed of such parts as the stomach for the storage and digestion of food, the organs for the throwing off of waste water, the blood vessels for the carriage of oxygen and food-holding blood, the legs or wings for locomotion.

1.The body of an animal is like a locomotive in that ().

A.it is composed of many parts that work just like different parts of a locomotive

B.it can do some particular kind of work

C.it works like all the machines in the world

D.both the animal and the locomotive need coal or wood as their fuel

2.Every part of the animal body().

A.works independently

B.works dependently on each other

C.looks like the same as that of a machine

D.has the same structure as that of a machine

3.The energy of an animal is provided by().

A.throwing off waste

B.the combustion of fuels such as coal or wood

C.consumption of food

D.the carriage of blood

4.The function of animal s legs is like__of a machine.

A.the wheels

B.chimney

C.steam pipes

D.the firebox

5.The steam pipes of a locomotive work like the()of an animal body.

A.stomach

B.blood vessels

C.legs

D.wings

aff this year. On behalf of the Community Service Center, Melinda will discuss the matter with John, who is the representative of Sunshine Medical Center. Melinda: Hello, I.m Melinda, from the () Department of Qiaoxiang Community Service Center. Nice to meet you! John: Hi, I.m John Waters, the representative of Sunshine Medical Center. Nice to meet you too! Melinda: Our center is going to launch a physical exam program for the staff this year. We.ve () very much about your good services. John: It.s a great () for us to have the chance to work with you. Our center will try our best to () good service for your center. Melinda: Could you suggest what physical exams we need to () ？ John: The physical should include examination of the heart and () as well as X-rays. Melinda: What else should we consider？ John: It also could include a look at the lungs, blood pressure and blood () . Melinda: Do you have any suggestions before our staff have their physical exams in your center？ John: Well, we will () a notice for everyone before they have the exam in our center. Melinda: That would be helpful. Thank you very much. Then how about the price for each person.