There are two types of markets in which firms face some competition yet are still able to have some control over the prices of their products. Those two types of market are

There are two types of twins: identical and non-identical twins. Identical twins are formed from a single egg in mother's body which divides to form. two separate babies. Identical twins look the same and are often dressed by their parents in clothes of the same colors. It is often difficult to tell identical twins from each other, even when they are standing side by side. Non-identical twins come into being when the mother produces two separated eggs at the same time, both of which grow to form. babies. In this case the twins look like normal brothers and sisters and are easy to tell one from the other.

In the 1970s and 1980s a scientist did some research into twins. He invited many pairs of identical twins to university and asked them to take part in a week of tests. He was particularly interested in adopted (收养) twins who had been separated at birth. He would give the twins different kinds of tests to study their speed of thinking, their speech, their memory, the ways they saw and heard different things, and so on. Time and time again he found separated twins who preferred clothes of the same color, used the same kind of shaving soap, wore the same shaped square glasses and the same colored socks.

There is a third type of twins, but it is a very unusual one. Twins who are joined together at birth are known in western countries as Siamese twins.

(1)It is difficult to tell identical twins because ____________.

A、they are dressed in the same clothes

B、they are dressed in the same color

C、they are very alike

D、they are standing side by side

(2)If the twins are easy to tell from each other, they are ____________.

A、very probably non-identical twins

B、surely non-identical twins

C、surely identical twins

D、always a brother and a sister

(3)Which of the following is NOT true according to this passage?

A、In the 1970s and 1980s a scientist did some research into the two main types of twins.

B、In the week of tests, he tested their speed of thinking, their speech, their memory and some other things.

C、There were twins who had been separated from each other as soon as they were born.

D、Very often, separated twins were found to choose things of the same kind, the same shape and the same color.

(4)According to the passage, how many types of twins are there actually?

A、one

B、two

C、three

D、four

(5)This passage mainly tells us ____________.

A、the main types of twins

B、what has been found out about twins

C、how twins are formed

D、how a scientist studied twins

There are some kinds of prisons in the world in which prisoners are treated very cruel. However, there is a prison in Iceland which allows its【11】to go out without any【12】to work every day. They work on the farms near the prison during the day, and come back to have their【13】and to sleep every evening. Before they are allowed to go out like this, they have to【14】to come back in the evening. If they do not do this, they are not【15】.

Which of the following does not support the statement "Yet there are some crucial ways in which Google differs from Microsoft."

A．Google is far more innovative than Microsoft.

B．Google will not be able to build Microsoft-style. of monopoly on the industry.

C．Office workers are more dependent on Microsoft software than on Google.

D．Google's market share in search industry has fallen substantially.

There are some kinds of rays from the sun which would burn us to death if we were not protected from them. 太阳中有些光线射到我们身上会把我们烧死，如果我们不防备的话。()

Basically, there are three types of fatigue, physical, pathological (由疾病引起的), and psychological. As you might suspect, each differs significantly from the others.

When you exercise your body you produce waste products. Muscles, for example, discard lactic acid (乳酸) into the blood; cells dump in carbon dioxide. When these wastes reach a certain level in the blood, the brain is notified and your activity level drops. Excess wastes in the muscles may produce soreness. If the blood of a physically fatigued animal is injected into a rested animal, it will produce fatigue. The solution to this type of fatigue is simple-rest. That should revive you; if it doesn't, another cause should be sought.

Have you ever become involved in so many activities that you had to be in two places at once? This is what happens when your body has a disease. The cells are overtaxed and cannot keep up with both fighting the disease and keeping you active. The result is fatigue. Some communicable diseases like the flu and colds are notorious for draining your energy. Other non-communicable diseases, like anemia (贫血), drain you because you are lacking an important body ingredient. Being overweight can cause pathological fatigue. It should be obvious that this type of fatigue is not going to go away without treatment. In a way, pathological fatigue is a lifesaver. It lets you know something is wrong and that you need rest. Even a poor diet can produce pathological fatigue. Frequently, people who go on crash diets develop pathological fatigue, and if the diet is not improved, they may do physical harm to their bodies.

Here is the most common type of fatigue. Almost everybody experiences it now and then. Often, the cause is an emotional war you arc waging with yourself or those around you. Some of these familiar factors can bring on psychological fatigue: worries, stress, lack of exercise, boredom, depression. If you know someone with psychological fatigue, would you advise him to rest? No way! That might be fine for our other types of fatigue, but for this one, it's deadly. If you are ever going to be able to cope with stress, depression, or worry, you need oxygen in your cells and a more optimistic attitude. Get out of the chair and do something! Believe it or not, many people throw themselves into physical labor like cleaning or carpentry to "defatigue" themselves. If you find yourself in a particularly stressful situation that you can't physically escape, escape mentally. When fatigue continues, maybe you need to get to the root of the problem.

The topic for this passage is ______.

A．the problems of insomnia

B．types of fatigue

C．the dangers of fatigue

D．people's need for rest

Basically, there are three types of fatigue: physical, pathological (由疾病引起的), and psychological. As you might suspect, each differs significantly from the others.

When you exercise your body you produce waste products. Muscles, for example, discard lactic acid (乳酸) into the blood; cells dump in carbon dioxide, When these wastes reach a certain level in the blood, the brain is notified and your activity level drops. Excess wastes in the muscles may produce soreness. If the blood of a physically fatigued animal is injected into a rested animal, it will produce fatigue. The solution to this type of fatigue is simple—rest. That should revive you; if it doesn't, another cause should be sought.

Have you ever become involved in so many activities that you had to be in two places at once? This is what happens when your body has a disease. The cells are overtaxed and cannot keep up with both fighting the disease and keeping you active. The result is fatigue. Some communicable diseases like the flu and colds are notorious for draining your energy. Other non-communicable diseases, like anemia (贫血), drain you because you are lacking an important body ingredient. Being overweight can cause pathological fatigue. It should be obvious that this type of fatigue is not going to go away without treatment. In a way, pathological fatigue is a lifesaver. It lets you know something is wrong and that you need rest. Even a poor diet can produce pathological fatigue. Frequently, people who go on crash diets develop pathological fatigue, and if the diet is not improved, they may do physical harm to their bodies.

Here is the most common type of fatigue. Almost everybody experiences it now and then. Often, the cause is an emotional war you are waging with yourself or those around you. Some of these familiar factors can bring on psychological fatigue, worries, stress, lack of exercise, boredom, depression. If you know someone with psychological fatigue, would you advise him to rest? No way! That might be fine for our other types of fatigue, but for this one, it's deadly. If you are ever going to be able to cope with stress, depression, or worry, you need oxygen in your cells and a more optimistic attitude. Get out of the chair and do something! Believe it or not, many people throw themselves into physical labor like cleaning or carpentry to "defatigue" themselves. If you find yourself in a particularly stressful situation that you can't physically escape, escape mentally. When fatigue continues, maybe you need to get to the root of the problem.

The topic for this passage is ______ 。

A．the problems of insomnia

B．types of fatigue

C．the dangers of fatigue

D．people's need for rest

听力原文： Social insects live in integrated communities which in some ways are similar to human communities. In both types of community there is division of labor. In insect societies, certain insects are responsible for reproduction; the workers collect food While the soldiers defend the colony. In the same way human groups such as farmers and shopkeepers have specialized functions in producing goods and providing services to the community.

Insect and human societies are also alike in that individual members of the community work together. White ant workers coordinate their efforts to build nests. Similarly, in human societies, engineers, architects, town planners and construction workers unite to build cities.

The nests of social insects are as complex as a man-made city. In some insect nests special accommodation is provided for the young and for food storage. Many nests also have devices for regulating the temperature. So insect nests are as functional as human houses.

It is not surprising, therefore, that many analogies have been made between social insects and human societies. It must not be forgotten, however, that insects' social behaviors are determined by innate instinctive mechanisms. Insects show no capacity for learning or for developing a social tradition based on learning.

(33)

A．They both live in communities.

B．They both have soldiers to defend their societies.

C．They both show great capacity for learning.

D．They both have a division of labor.