改变知觉

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问题:

改变知觉

考点:旅游心理学旅游心理学题库
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义务消防队的主要职责是什么?

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同学们都患过感冒,注射过青霉素,开始用该药时,效果显著,由于反复使用,致使细菌对青霉素的抗药性越来越强,治疗效果越来越差。虽然制药厂不断开发新型青霉素,如头孢氨苄,派拉西林钠等,但总也对付不了一些感冒病毒,为什么?请思考并回答。

(1)青霉素作用前,感冒病毒对各种药物的抗药性存在着    _______  ,患病者使用青霉素后体内绝大多数感冒病毒被杀死,这是________         ,极少数抗药性强的个体存活下来并繁殖后代,这是_________       

(2)青霉素的使用对感冒病毒起了   _____   作用,这种作用是通过感冒病毒与环境之间的________实现的。由于青霉素的反复使用,就会使抗药性强这个性状逐代积累而保留下来。

(3)上述  ________    生存_________       被淘汰的现象叫自然选择。

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何谓肉芽肿性炎症?常见的病因有哪些?

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骆宾王家中后来衰落

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Any normal species would be delighted at the prospect of cloning. No more nasty surprises like sickle cell or Down syndrome--just batch after batch of high-grade and, genetically speaking, immortal offspring! But representatives of the human species are responding as if someone had proposed adding Satanism to the grade-school Curriculum. Suddenly, perfectly secular folks are throwing around words like sanctity and retrieving medieval-era arguments against the pride of science. No one has proposed burning him at the stake, but the poor fellow who induced a human embryo to double itself has virtually recanted proclaiming his reverence for human life in a voice, this magazine reported," choking with emotion."

There is an element of hypocrisy to much of the anti-cloning furor, or if not hypocrisy, superstition. The fact is we are already well down the path leading to genetic manipulation of the creepiest sort. Life-forms can be patented, which means they can be bought and sold and potentially traded on the commodities markets. Human embryos are life-forms, and there is nothing to stop anyone from marketing them now, on the same shelf with the Cabbage Patch dolls.

In fact, any culture that encourages in vitro fertilization has no right to complain about a market in embryos. The assumption behind the in vitro industry is that some people’s genetic material is worth more than others’ and deserves to be reproduced at any expense. Millions of low-income babies die every year from preventable ills like dysentery, while heroic efforts go into maintaining yuppie zygotes in test tubes at the unicellular stage. This is the dread "nightmare” of eugenics in familiar, marketplace form which involves breeding the best-paid instead of the best. Cloning technology is an almost inevitable byproduct of in vitro fertilization. Once you decide to go to the trouble of in vitro, with its potentially hazardous megadoses of hormones for the female partner and various indignities for the male, you might as well make a few backup copies of any viable embryo that’s produced. And once you’ve got the backup organ copies, why not keep a few in the freezer, in case Junior ever needs a new kidney or cornea

The critics of cloning say we should know what we’re getting into, with all its Orwellian implications. But if we decide to outlaw cloning, we should understand the implications of that. We would be saying in effect that we prefer to leave genetic destiny to the crap shooting of nature, despite sickle-cell anemia and Tay-Sachs and all the rest, because ultimately we don’t trust the market to regulate life itself. And this may be the hardest thing of all to acknowledge: that it isn’t so much 21st century technology we fear, as what will happen to that technology in the hands of old-fashioned 20th century capitalism.

It is implied in the 3rd paragraph that it is()

A. dishonest to deny some genetic manipulations

B. impractical to change our genetic destiny

C.dangerous to prepare backup copies

D. irrational to oppose financial operations

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