2021年大學(xué)英語(yǔ)四級(jí)聽(tīng)力訓(xùn)練

1、大學(xué)英語(yǔ)四級(jí)聽(tīng)力訓(xùn)練 大學(xué)英語(yǔ)四級(jí)聽(tīng)力訓(xùn)練不在一朝一夕，而在于長(zhǎng)長(zhǎng)久久的決心。下面是 _給大家的大學(xué)英語(yǔ)四級(jí)聽(tīng)力訓(xùn)練美文的相關(guān)知識(shí)，供大家參閱! Hotter or Colder ? It was on _ thought that air pollution affected only the area immediately around large citieswith factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air

2、 pollution, the problem isliterally worldwide. On several oasions over the past decade, a heavy cloud of air pollution has covered theentire eastern half of the United States and led to health warnings even in rural areas awayfrom any _jor con _ntration of _nufacturing and automobile traffic. In fac

3、t, the cli _te of the entire earth _y be affected by air pollution. Some scientists feel that the increasing con _ntration of carbon dioxide in the air resultingfrom the burning of fossil fuels (coal and oil) is creating a “greenhouse effect” holding inheat reflected from the earth and raising the w

4、orlds average temperature. If this view is correct and the worlds temperature is raised only a few degrees, much of thepolar i _ cap will melt and cities such as New York, Boston, Miami, and New Orleans will be underwater. Another view, less widely held, is that increasing particulate _tter in the a

5、tmosphere i _locking sunlight and lowering the earths temperature a result that would be equallydisastrous. A drop of just a few degrees could create something close to new i _ age and would _keagriculture difficult or impossible in _ny of our top farming areas. At present we do not know for sure th

6、at either of these conditions will happen (though onere _nt gover _ent report prepared by experts in the field concluded that the greenhouseeffect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the worldstemperature will stay about the same as it is now

7、. People with Disabilities People with disabilities aprise a large part of the population. It is esti _ted that over 35 million Americans have physical, mental, or other disabilities. About half of these disabilities are “developmental”, i.e., they our prior to the individualstwenty-second birthday,

8、 often from geic conditions, and are severe enough to affect threeor more areas of development, such as mobility, munication, employment, etc. Most other disabilities are considered “adventitious”, i.e., aidental or caused by outsidefor _s. Prior to the 20th _ntury, only a s _ll per _ntage of people

9、 with disabilities survived for long. Medical treatment for these disabilities was unavailable. Advan _ments in medicine and social servi _s have created a cli _te in which people withdisabilities can expect to have such basic needs as food, shelter, and medical treatment. Unfortunately, these basic

10、s are often not available. Civil liberties such as the right to vote, _rry, get an education, and gain employment havehistorically been denied on the basis of disability. In re _nt decades, the disability rights movement has been organized to fight against theseinfringements of civil rights. Congres

11、s responded by passing _jor legislation recognizing people with disabilities as aprotected class under civil rights statutes. Still today, people with disabilities must fight to live their lives independently. It is esti _ted that more than half of qualified Americans with disabilities are unemploye

12、d, anda _jority of those who do work are underemployed. About two-thirds live at or below the official poverty level. Significant barriers, especially in transportation and public awareness, prevent disabledpeople from taking part in society. For example, while no longer prohibited by law from _rryi

13、ng, a person with no aess totransportation is effectively excluded from munity and social activities which might leadto the development of long-term relationships. Will Man Conquer Spa _? Man will never conquer spa _. Such a statement _y sound absurd, after we have _de such long strides into spa _.

14、Yet it expresses a truth that our forefathers knew and we have forgotten， one that ourdes _ndants must learn again, in heartbreak and loneliness. Our age is in _ny ways unique, full of phenomena that never ourred before and _y nevere again. They distort our thinking, _ us believe that what is true n

15、ow will be true forever, thoughperhaps on a larger scale. Because we have annihilated distan _ on this pla, we i _gine that we can do the same inspa _. The truth is otherwise, and we will see it more clearly if we forget the present and turn ourminds toward the past. To our an _stors, the vastness o

16、f the earth was a dominant factor in their thoughts and lives. No _n could ever see more than a tiny fraction of the earth. Only a lifetime ago, parents waved farewell to their emigrating children, knowing they wouldnever see them again. Now, within one incredible generation, all this has changed. P

17、sychologically as well as physically, there are no longer any remote pla _s on earth. When a friend leaves for what was on _ a distant country, he cannot feel the same sense ofirrevocable separation that saddened our forefathers. We know that he is only hours away by air, and we have merely to reach for the telephone tohear his voi _. When the sa _ite munication work is fully established, it will be as easy to seefriends on the far side of the earth as to talk to them on the other side of the