There is one difference between the sexes on which every expert and study agrees: men are more aggressive than women. It shows up in 2-year-olds. It continues through school days and persists into adulthood. It is even constant across cultures. And there is little doubt that it is rooted in biology.

      If there's a woman’s trait(特点) which is the same as men’s aggressiveness, it's what social scientists refer to as the result of "education". Feminists have argued that the caring nature of women is not biological in origin, but rather has been forced into women by a society that wanted to keep them in the home. But the signs that it is at least partly inborn are too numerous to ignore. Just as tiny infant girls respond more readily to human faces, female toddlers(学步者) learn much faster than males how to pick up nonverbal cues（非言语暗示） from others. And grown women are far more skilful than men at interpreting facial expressions: A recent study by University of Pennsylvania brain researcher Ruben Gur showed that they easily read emotions such as anger, sadness and fear. The only such emotion men could pick up was disgust.

　 What difference do such differences make in the real world? Among other things, women appear to be somewhat less competitive--or at least competitive in different ways--than men. At the Harvard Law School, for instance, female students enter with qualities just as outstanding as those of their male peers. But they don' t qualify for the well-known Law Review in proper numbers, a fact some school officials owe to women' s discomfort in the incredibly competitive atmosphere.

　　Students of management styles have found fewer differences than they expected between men and women who reach leadership positions, perhaps because many successful women deliberately imitate men. But an analysis by Purdue social psychologist Alice Eagly of 166 studies of leadership style did find one difference: Men tend to be more “autocratic”-making decisions on their own--while women tend to consult colleagues more often.  Studies of behavior in small groups turn up even more differences. Men will typically dominate the discussion, says University of Toronto psychologist Kenneth Dion, spending more time talking and less time listening.

The passage mainly discusses__________.

　           A. how sex differences are demonstrated in social relations

　　      B. how hormone determines sex differences

　　      C. why there are differences between males and females

　　      D. why men and women have different social roles

Which of the following is true of women's nurturing nature according to the passage?

A. It is not inborn in any sense.

B. It is inspired by women’s families.

C. It is caused by social prejudice.

D. It is partly biological in origin.

The Harvard Law School example in paragraph 3 suggests that_________.

A. women are not as competitive as men

B. law is not the fight profession for women

C. women are as excellent as men when they are young

D. academic qualities are not equal to performance

Which of the following statement is true according to paragraph 4?

A. Men leaders should consult colleagues and subordinates more often.

B. Female leaders' success is due to their imitating male leaders.

C. Men and women are different in their leadership style.

D. Decisiveness is an important quality for a successful politician.

It can be inferred from the passage that the writer_________.

A. denies the difference sexes make in real life

B. is prejudiced against men

C. discourages women to be competitive

D. treats sex difference objectively

Scientists are closely concerned with the structure of buildings and with the quality of building materials． The World health Organization （WHO) observes that the introduction of air conditioning and energy conservation （保护) measures have been accompanied by growing problems of indoor air quality． Some pollutants arise from insulation （隔音) products, some from moving cars, and others from modern housing materials． As many Europeans spend up to 90% of their lives in buildings, the health effects of the indoor climate are very important．

　　Some construction materials, including fiberboard, insulation foams and certain glues for man-made wood floor boards, for example, give out organic products such as formaldehyde （甲醛)． Heat and humidity increase the release of formaldehyde and the gas seriously harms the eyes． Paint, lacquer, etc． can also release dangerous gas into indoor air．

　　Construction materials can cause serious damage, especially when they contain asbestos（石棉）． Asbestos is naturally present in rock formations worldwide． It belongs to a family of mineral substances made up of solid, non-combustible（非易燃品） fiber． These properties make asbestos a highly sought-after construction material． As early as 1931, however, public health officers in the United Kingdom revealed the connection between breathing in asbestos dust and such diseases as lung cancer．

　　The land on which a building is sited may also contribute to pollution． Some kinds of granite or similar rocks contain traces of radium． As it breaks down, this naturally radioactive element produces some kind of radioactive gas that goes through tiny cracks in walls, floors and building materials, and makes its way into the building and the rooms． The better the homes are insulated, the more is the dangerous gas in indoor air． The main effect of this dangerous gas on health is to increase the risk of lung cancer．

1.What is the main idea of the passage?

    A．Some building materials pollute indoor air．

    B．Some factors cause indoor air pollution．

    C．Asbestos can cause lung cancer．

    D．The land on which houses are built contributes to indoor pollution．

2.Why are Europeans particularly concerned with building materials?

    A．Lots of building materials there are radioactive．

    B．They stay home up to 90% of their lives．

    C．They have a high rate of lung cancer．

    D．They spend most of their time indoors．

3.Why is asbestos a sought-after building material?

    A．It is a kind of insulation foam．

    B．Asbestos will not give out dangerous gas．

    C．This material is not easy to catch fire．

    D．It is rarely present in rock formations．

4.Why should we be careful about the land on which a building is to be sited?

    A．To determine whether the land is firm enough for a building to be sited on．

    B．To make sure that the land contains no radioactive material．

    C．To make certain that the land releases no formaldehyde or other gases．

    D．To check whether it contains any combustible materials．

Scientists are closely concerned with the structure of buildings and with the quality of building materials． The World health Organization （WHO) observes that the introduction of air conditioning and energy conservation （保护) measures have been accompanied by growing problems of indoor air quality． Some pollutants arise from insulation （隔音) products, some from moving cars, and others from modern housing materials． As many Europeans spend up to 90% of their lives in buildings, the health effects of the indoor climate are very important．
　　Some construction materials, including fiberboard, insulation foams and certain glues for man-made wood floor boards, for example, give out organic products such as formaldehyde （甲醛)． Heat and humidity increase the release of formaldehyde and the gas seriously harms the eyes． Paint, lacquer, etc． can also release dangerous gas into indoor air．
　　Construction materials can cause serious damage, especially when they contain asbestos（石棉）． Asbestos is naturally present in rock formations worldwide． It belongs to a family of mineral substances made up of solid, non-combustible（非易燃品） fiber． These properties make asbestos a highly sought-after construction material． As early as 1931, however, public health officers in the United Kingdom revealed the connection between breathing in asbestos dust and such diseases as lung cancer．
　　The land on which a building is sited may also contribute to pollution． Some kinds of granite or similar rocks contain traces of radium． As it breaks down, this naturally radioactive element produces some kind of radioactive gas that goes through tiny cracks in walls, floors and building materials, and makes its way into the building and the rooms． The better the homes are insulated, the more is the dangerous gas in indoor air． The main effect of this dangerous gas on health is to increase the risk of lung cancer．
【小题1】What is the main idea of the passage?