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Treating meat with irradiation kills many bacteria that can cause illness but it also triggers chemical decompositions. These decompositions produce substances that can cause cancer. Thorough cooking kills the same bacteria in meat as does irradiation treatment. Therefore, to minimize health risks, meat should be cooked thoroughly rather than treated with irradiation. Which of the following, if true, most seriously weakens the argument above?
(A) Neither thorough cooking nor irradiation treatment can kill all of the bacteria present in some meats.
(B) Since radiation was first used to treat meat, the amount of irradiation required for the process has been greatly reduced.
(C) Not all of the substances produced by the chemical decompositions triggered by irradiation are potentially carcinogenic.
(D) Some of the bacteria that are found in cooked meat are beneficial to digestive processes in humans.
(E) Thoroughly cooked, unirradiated meat contains potentially carcinogenic substances identical to those found in meat treated with radiation.
Even though vegetable meal is nutritious to fish and less costly to use than anchovy meal, most fish farmers feed their fish only anchovy meal because fish prefer its taste and consequently gain weight faster. Farmed fish would gain weight faster still on a diet consisting of a new seafood product, but this diet’s advantages did not compensate its additional cost. Nevertheless, the product’s developers predict that their product will be a commercially successful food for farmed fish. Which of the following, if true, most helps to justify the developer’s prediction? A Farmed fish preferred taste of a mixture of the new product and vegetable meal over the taste of anchovy meal B In the wild, fish of the species that are commonly farmed have diets that are more similar to in composition to the new product than to anchovy meal. C A pound of the new product provides more calories to farmed fish than does a pound of anchovy meal. D The new product can only be used as fish food whereas anchovy meal can be used for a variety of other purposes. E The new product will be sold at artificially low prices throughout introductory period in order to entice fish farmers to use it at least once.
参考答案:EA
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