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The presence of microorganisms that produce a toxin cause sea water 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 otters 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?
(A) In some of the area where red tides occur, neither clams nor sea otters are indigenous species.
(B) The presence of sea otters in a given area has a significant effect on which other marine organisms are to be found in that area.
(C) When seawater 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.
(E) Although very small amounts of the toxin produced during a red tide are not harmful, large doses can be fatal to animals the size of sea otters.
这道题答案给的是D，我选的C
我的理由：原文的逻辑是：有contaminated clams就没有otter→otter can taste toxin.
C答案说：给人工red(no toxin)，也会没有otter→toxin不是原因→cannot taste toxin
d答案说有contaminated clams with toxin,就没有otter，是支持了结论啊
到底是我没想清楚逻辑关系还是答案有问题 |
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发表于 2011-4-26 16:31:38
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