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The presence of microorganisms that produce a toxin causes seawater to turn brownish red, phenomenon known as a red ride. Sea otters do not feed in areas where clams, their main source of food, have become contaminated with this toxin. According to a proposed explanation of the otter’s behavior, the otter sample the clams in a potential feeding area and can taste any toxin in them.
Which of the following, if true, would most strongly indicate that the hypothesis described in the last sentence of the passage is not correct?
(C) When sea water in an area unaffected by red tide is artificially dyed brownish red, sea otters do not feed on the clams in that area. (D) If the clams in a given areas are contaminated with toxin, sea otters move to other areas in search of food.
哪位同学能帮我看看为什么D是正确的而C是错误的？
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发表于 2009-6-23 09:21:00
