题目内容：
The Gene IndustryMajor companies are already in pursuit of commercial application of the new biology．They dream of placing enzymes(酶) in the automobile to monitor exhausts and send data on pollution to a microprocessor(微处理机)that will then adjust the engine． They speak of what the Nero York Times calls "metal-hungry microbes(渴望吃金属的微生物) that might be used to mine valuable trace metals(微量金属) from ocean water"． They have already demanded and won the right to patent new lifeforms．
Nervous critics, including many scientists, worry that there is corporate, national,international,and inter-scientific rivalry in the entire biotechnological(生物工艺家) field．They create images not of oil spills, but of “microbe spills” that could spread diseases and destroy entire populations． The creation and accidental release of extremely poisonous microbes, however, is only one cause for alarm． Completely rational and respectable scientists are talking about possibilities that stagger the imagination．
Should we breed people with cow-like stomachs so they can digest grass and hay,
thereby relieving the food problem by modifying us to eat lower down on the food chain？Should we biologically alter workers to fit the job requirement, for example, creating pilots with faster reaction times or assembly-line workers designed to do our monotonouswork for us？ Should we attempt to eliminate “inferior” people and breed a“super-race”？(Hitler tried this, but without the genetic weaponry that may soon issue from our labora-tories． ) Should we produce soldiers to do our fighting？ Should we use genetic forecasting
to pre-eliminate “unfit” babies？ Should we grow reserve organs(备用器官) for ourselves,each of us having, as it were, a "savings bank"．(储蓄银行)full of spare kidneys．, livers, or hands？
Wild as these notions may sound, every one has its advocates (and opposers) 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 a market for the new technology will be created． ”According to the passage, the exhaust from a car engine could probably be checked by____ A．using metal-hungry microbe
B．making use of enzyme
C．adjusting the engin
D．patenting new lifoform
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