When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches， fatigue， irritability， and some particularly sensitive people suffer nausea or even mental disturbance. Animals are also affected， particularly before earthquakes， snakes have been observed to come out of hibernation， rats to flee from their burrows， dogs howl and cats jump about unaccountably. This has led the US Geographical Survey to fund a network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas such as California.

　　Conversely， when large numbers of negative ions are present， then people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea， close to waterfalls or fountains， or in any place where water is sprayed， or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea， or in the mountains with tumbling streams or waterfalls.

　　To increase the supply of negative ions indoors， some scientists recommend the use of ionisers： small portable machines， which generate negative ions. They claim that ionisers not only clean and refresh the air but also improve the health of people sensitive to excess positive ions. Of course， there are the detractors， other scientists， who dismiss such claims and are skeptical about negative/positive ion research. Therefore people can only make up their own minds by observing the effects on themselves， or on others， of a negative rich or poor environment. After all it is debatable whether depending on seismic readings to anticipate earthquakes is more effective than watching the cat.

　　1.What effect does exceeding positive ionization have on some people?

　　A.They think they are insane.

　　B.They feel rather bad-tempered and short-fussed.

　　C.They become violently sick.

　　D.They are too tired to do anything.

　　2.In accordance with the passage， static electricity can be caused by___.

　　A.using home-made electrical goods.

　　B.wearing clothes made of natural materials.

　　C.walking on artificial floor coverings.

　　D.copying TV programs on a computer.

　　3.A high negative ion count is likely to be found___.

　　A.near a pound with a water pump.

　　B.close to a slow-flowing river.

　　C.high in some barren mountains.

　　D.by a rotating water sprinkler.

　　4.What kind of machine can generate negative ions indoors?

　　A.Ionisers.

　　B.Air-conditioners.

　　C.Exhaust-fans

　　D.Vacuum pumps.

　　5.Some scientists believe that___.

　　A.watching animals to anticipate earthquakes is more effective than depending on seismography.

　　B.the unusual behavior of animals cannot be trusted.

　　C.neither watching nor using seismographs is reliable.

　　D.earthquake

　　答案：

　　BCDAA

　　六級(jí)閱讀理解模擬練習(xí)2：

　　Once it was possible to define male and female roles easily by the division of labor. Men worked outside the home and earned the income to support their families， while women cooked the meals and took care of the home and the children. These roles were firmly fixed for most people， and there was not much opportunity for women to exchange their roles. But by the middle of this century， men‘s and women’s roles were becoming less firmly fixed.

　　In the 1950s， economic and social success was the goal of the typical American. But in the 1960s a new force developed called the counterculture. The people involved in this movement did not value the middle-class American goals. The counterculture presented men and women with new role choices. Taking more interest in childcare， men began to share child-raising tasks with their wives. In fact， some young men and women moved to communal homes or farms where the economic and childcare responsibilities were shared equally by both sexes. In addition， many Americans did not value the traditional male role of soldier. Some young men refused to be drafted as soldiers to fight in the war in Vietnam.

　　In terms of numbers， the counterculture was not a very large group of people. But its influence spread to many parts of American society. Working men of all classes began to change their economic and social patterns. Industrial workers and business executives alike cut down on “overtime” work so that they could spend more leisure time with their families. Some doctors， lawyers， and teachers turned away from high paying situations to practice their professions in poorer neighborhoods.

　　In the 1970s， the feminist movement， or women‘s liberation， produced additional economic and social changes. Women of all ages and at all levels of society were entering the work force in greater numbers. Most of them still took traditional women’s jobs as public school teaching， nursing， and secretarial work. But some women began to enter traditionally male occupations： police work， banking， dentistry， and construction work. Women were asking for equal work， and equal opportunities for promotion.

　　Today the experts generally agree that important changes are taking place in the roles of men and women. Naturally， there are difficulties in adjusting to these transformations.

　　1.Which of the following best express the main idea of Paragraph 1?

　　A.Women usually worked outside the home for wages.

　　B.Men and women‘s roles were easily exchanged in the past.

　　C.Men’s roles at home were more firmly fixed than women‘s.

　　D.Men and women’s roles were usually quite separated in the past.

　　2.Which sentence best expresses the main idea of Paragraph 2?

　　A.The first sentence.

　　B.The second and the third sentences.

　　C.The fourth sentence.

　　D.The last sentence.

　　3.In the passage the author proposes that the counterculture___.

　　A.destroyed the United States.

　　B.transformed some American values.

　　C.was not important in the United States.

　　D.brought people more leisure time with their families.

　　4.It could be inferred from the passage that___.

　　A.men and women will never share the same goals.

　　B.some men will be willing to exchange their traditional male roles.

　　C.most men will be happy to share some of the household responsibilities with their wives.

　　D.more American households are headed by women than ever before.

　　5.The best title for the passage may be ___.

　　A.Results of Feminist Movements

　　B.New influence in American Life

　　C.Counterculture and Its consequence

　　D.Traditional Division of Male and Female Roles.

　　答案：

　　DCBCB