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发布时间：2006-06-22 13:27     点击：

    (A) Microorganisms resistant to drugs

    (B) Therapeutically useful circlets of genes.

    (C) Anti-infective drugs like penicillin

    (D) Viruses for use by molecular biologists

    (E) Vehicles for performing gene transplant experiments

    19. It can be inferred from the passage that the author believes that those in favor of stiffening the restrictions on gene transplant research should logically also

    (A) encourage experiments with any plasmids except those bearing genes for antibiotic resistance

    (B) question the addition of anti-infective drugs to livestock feeds

    (C) resist the use of penicillin and tetracyclines to kill microorganisms

    (D) agree to the development of meatier live- stock through the use of antibiotics

    (E) favor congressional debate and discussion of all science and health issues

    20. 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

    Like magpies, children's minds pick up bits and pieces of data. if you encourage them, they will drop these at your feet-Republicans and (60)Democrats, the tripartite division of the federal system, perhaps even the capital of Massachu- setts. But until the adolescent has grasped the integumental function that concepts and prin- ciples provide, the data remain fragmented, random, disordered.

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