There is an English saying:“1._________.” Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body. 2. _________.
Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. 3.__________. If laughter exercises the body, it must be beneficial.
Other tests have shown that laughter appears to be able to reduce the effect of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group that tolerated(忍耐) the pain for the longest time was the group which listened to a funny program. 4._________.
5.__________. They have found that even if their patients do not really feel like laughing , making them smile is enough to produce beneficial effects similar to those caused by laughter.

Howling is a behaviour commonly observed among a wolf pack. As pack animals, wolves work together to hunt and rely on howling as an important means of communication among each other. There are different explanations of a wolf’s howl and it appears that there may be more to discover.

One theory is that wolves howl to bond better together. It’s almost as if howling together helps the pack stay together. Perhaps something similar to people feeling a sense of involvement with each other when singing a song together. But this theory may be wrong, explains Fred H. Harrington, a professor who studies wolf behaviour.

Indeed, there have been times when wolves have been seen one moment howling in a chorus, and the next, quarreling among each other. It appears that usually the lowest-ranking members of the pack may actually be “punished” for joining in the chorus at times. So is howling a way to strengthen a social bond or just a way to reconfirm status among its members? —Why do wolves howl for sure?

What is clear, however, is that howling is often used among packmates to locate each other. Hunting grounds are distant and it happens that wolves may separate from one another at times. When this happens, howling appears to be an excellent means of gathering.

Howling, interestingly, is a contagious behaviour. When one wolf starts to howl, very likely others will follow. This is often seen to occur in the morning, as if wolves were doing some sort of “roll call” where wolves all howl together to report their presence.

1.What is the possible similarity between wolves’ howling together and humans’ singing in chorus?

A. The act of calling each other.          B. The sense of accomplishment.

C. The act of hunting for something.      D. The sense of belonging to a group.

2.Why does Harrington think the “social bond” theory may be wrong?

A. Wolves separate from each other after howling. 

B. Wolves tend to protect their hunting grounds.

C. Wolves sometimes have quarrels after howling together.

D. Wolves of low rank are encouraged to join in the chorus.

3.Researchers are sure that wolves often howl to ______.

A. show their ranks               B. find their companions

C. report the missing ones          D. express their loneliness

4.“Howling… is a contagious behaviour” (in the last paragraph) means _______.

A. howling is a signal for hunting       

B. howling is a way of communication

C. howling often occurs in the morning   

D. howling spreads from one to another

根据短文内容，在短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

There is an English saying:“_________.” Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body. _________.

Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. __________. If laughter exercises the body, it must be beneficial.

Other tests have shown that laughter appears to be able to reduce the effect of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group that tolerated(忍耐) the pain for the longest time was the group which listened to a funny program. _________.

__________. They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.

A. Laughter can prolong one’s life.

B. As a result of these discoveries, some doctors in the United States now hold laughter clinics in which they help to improve their patients’ condition by encouraging them to laugh.

C. The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain.

D. It increases blood pressure, the heart beating and breathing; it also works several groups of muscles in the face, the stomach and even the feet.

E. Although laughter helps cure the disease, doctors still can not put this theory into clinic practice.

F. Laughter is the best medicine.

G. They have found that laughter really can improve people’s health.

People have wondered for a long time how their personalities and behaviors are formed．It is not easy to explain why one person is intelligent and another is not, or why one is cooperative and another is competitive．

Social scientists are, of course, extremely interested in these types of questions．They want to explain why we possess certain characteristics and exhibit certain behaviors．There are no clear answers yet, but two distinct schools of thought on the matter have developed．As one might expect, the two approaches are very different from one another, and there is a great deal of debate between proponents of each theory．The controversy is often referred to as  “nature and nurture”．

Those who support the “nature” side of the conflict believe that our personalities and behavior patterns are largely determined by biological and genetic factors．That our environment has little, if anything, to do with our abilities, characteristics, and behavior is central to this theory．Taken to an extreme, this theory maintains that our behavior is predetermined to such a degree that we are almost completely governed by our instincts（本能）．

Proponents of the “nurture” theory, or, as they are often called, behaviorists, claimed that our environment is more important than our biologically based instincts in determining how we will act．A behaviorist, B．F．Skinner, sees humans as beings whose behavior is almost completely shaped by their surroundings．The behaviorists’ view of the human being is quite mechanistic; they maintain that, like machines, humans’ respond to environmental stimuli（刺激） as the basis of their behavior．

Socially and politically, the consequences of these two theories are far-reaching．In the US, for example, blacks often score below whites on standardized intelligence tests．This leads some “anature” proponents to conclude that blacks are genetically lower in status than whites．Behaviorists, on the contrary, say that the differences in scores are due to the fact that blacks are often robbed of many of the educational and other environmental advantages that whites enjoy, and that, as a result, they do not develop the same responses that whites do．

Either of these theories cannot yet fully explain human behavior．In fact, it is quite likely that the key to our behavior lies somewhere between these two extremes．That the controversy will continue for a long time is certain．

1.This passage is mainly concerned with              ．

    A．relation between personality and behavior

    B．relation between behavior and environment

    C．different accounts of patterns of human behavior

    D．different theories of the formation of human behavior

2.The underlined word " proponents'' in paragraph 2 means           ．

    A．creators         B．advisors         C．advocates        D．judges

3.In paragraph 5 , the author mainly writes about           ．

    A．the considerable influence of the two theories

    B．differences between the blacks and whites

    C．racial discrimination in the United States

    D．different responds to intelligence tests

4.What's the author's purpose in writing the passage?

    A．To call our attention to the changes of human behavior．

    B．To urge scientists to do more research in social science．

    C．To give us a detailed explanation of human behavior．

    D．To present an argument in the field of social science．

We often use the words “growth” and “development” as if they meant basically the same thing. But this may not always be the case. One can easily imagine instances in which a country has achieved higher levels of income (growth) with little or no benefit coming to most of its citizens (development).

In the past, most development policies were aimed at increasing the growth rate of income per capita (人均所得). Many are still based on the theory that benefit of economic growth will come to all members of society. If this theory is correct, growth should encourage development.

By the early 1970s, however, the relationship between growth and development was being questioned. A major study by the World Bank in 1974 concluded that it is now clear that more than decades of rapid growth in developing countries has been of little benefit to & third of their population.

The World Bank study showed that increase in GNP per capita did not promise important improvements in such devel??opment indicators as nutrition (营养), health, and education. Although GNP per capita did indeed rise, its benefit came down to only a small part of the population. This realization gives rise to a call for new development policies. These new policies favor agriculture over industry, call for national redis??tribution (资源分配) of income and wealth, and encourage programs to satisfy such basic needs as food and shelter.

In the late 1970s and early 1980s the international macroeconomic crises (大规模的经济危机) of high oil prices, worldwide recession (衰退) and the third world debt, forced attention away from programs designed to get rid of poverty. however, the lesson remains: economic growth does not prom??ise economic development. Efforts may be required to change growing output capacity (能力) into economic benefit that reach most of a nation’s people.

What do we learn from the first paragraph about the relationship between growth and development?

A. Growth and development refer to the same thing.

B. Growth always brings about development.

C. Development is not a necessary result of growth.

D. Development is a reliable measure of growth.

Before the 1970s, most development policies were based on theory that economic growth would benefit ________.

A. most people in society                  B. some people in society

C. few people in society                   D. everyone in society

according to the study by the World Bank in 1974, economic growth in some backward countries brought ________.

A. benefit to a third of their population

B. benefit to two thirds of their population

C little benefit to their people

D. no benefit at all to their people

If the passage continues, what would the author most likely discuss in the next paragraph?

A. How to turn growth into development.

B. How to remove poverty from society.

C. How to decrease the third world debt.

D. How to cope with economic crises.