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GRE阅读真题在线练习附答案六十四

2018-06-13 16:00:00 来源:新东方在线

  为了帮助大家更好地提高GRE阅读成绩,大家在平时的练习中,可以多找一些真题来进行练习。这样能够辅助大家整体的来备考GRE阅读,并且能够找到自己在模拟练习中的不足,加以改正。下面就跟随新东方在线GRE频道一起来看看吧!

点击查看》》》【GRE阅读真题在线练习附答案汇总】

  The Food and Drug Administration has recently proposed severe restrictions on the use of antibiotics to promote the health and growth of meat animals. Medications added to feeds kill many microorganisms but also encourage the appearance of bacterial strains that are resistant to anti-infective drugs. Already, for example, penicillin and the tetracyclines are not as effective therapeutically as they once were. The drug resistance is chiefly conferred by tiny circlets of genes, called plasmids, that can be exchanged between different strains and even different species of bacteria. Plasmids are also one of the two kinds of vehicles (the other being viruses) that molecular biologists depend on when performing gene transplant experiments. Even present guidelines forbid the laboratory use of plasmids bearing genes for resistance to antibiotics. Yet, while congressional debate rages over whether or not to toughen these restrictions on scientists in their laboratories, little congressional attention has been focused on an ill-advised agricultural practice that produces known deleterious effects.

  In the passage, the author is primarily concerned with

  A.Discovering methods of eliminating harmful microorganisms without subsequently generating drug-resistant bacteria

  B.Explaining reasons for congressional inaction on the regulation of gene transplant experiments

  C.describing a problematic agricultural practice and its serious genetic consequences

  D.Verifying the therapeutic ineffectiveness of anti-infective drugs

  E.evaluating recently proposed restrictions intended to promote the growth of meat animals

  According to the passage, the exchange of plasmids between different bacteria can results in which of the following'?

  A.Microorganisms resistant to drugs

  B.Therapeutically useful circlets of genes

  C.Anti-infeetive drugs like penicillin

  D.Viruses for use by molecular biologists

  E.Vehicles for performing gene transplant experiments

  The author's attitude toward the development of bacterial strains that render antibiotic drugs ineffective can best be described as

  A.Indifferent

  B.Perplexed

  C.Pretentious

  D.Insincere

  E.Apprehensive

  正确答案:C A E

  以上就是关于“GRE阅读真题在线练习附答案六十四”的内容,更多精彩内容,请关注GRE频道!

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