Wild as these notions may sound, every one has its advocates in the scientific community as well as its striking commercial application. As two critics of genetic engineering, Jeremy Rifkin and Ted Howard, state in their book Who should Play God?, Broad scale genetic engineering will probably be introduced to America much the same way as assembly lines, automobiles, vaccines, computers and all the other technologies. As each new genetic advance becomes commercially practical, a new consumer demand will be exploited and market for the new technology will be created.

　　41. According to the passage, the exhaust from a car engineer could probably be checked by _____.

　　A. using metal-hungry microbes.

　　B. making use of enzymes.

　　C. adjusting the engine.

　　D. patenting new lifeforms.

　　42. According to the passage, which of the following would worry the critics the most?

　　A. The unanticipated explosion of the population.

　　B. The creation of biological solar cells.

　　C. The accidental spill of oil.

　　D. The unexpected release of destructive on microbes

　　43. Which of the following notions is NOT mentioned?

　　A. Developing a savings bank of ones organs.

　　B. Breeding soldiers for a war.

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