2. 外语
  3. Second World War than in calling for women to return to domestic life after the war. Since the Hawaiian Islands have never been

Second World War than in calling for women to return to domestic life after the war. Since the Hawaiian Islands have never been

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问题 Second World War than in calling for women to return to domestic life after the war.
Since the Hawaiian Islands have never been connected to other land masses, the great variety of plants in Hawaii must be a result of the long-distance dispersal of seeds, a process that requires both a method of transport and an equivalence between the ecol-line ogy of the source area and that of the recipient area. 5 There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these hypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of 10 fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.
The author of the passage is primarily concerned with
选项 A、discussing different approaches biologists have taken to testing theories about the distribution of plants in Hawaii
B、discussing different theories about the transport of plant seeds to Hawaii
C、discussing the extent to which air currents are responsible for the dispersal of plant seeds to Hawaii
D、resolving a dispute about the adaptability of plant seeds to bird transport
E、resolving a dispute about the ability of birds to carry plant seeds long distances
答案B
解析 Given the description of the passage above, it is clear that Choice B is correct: the passage focuses on "different theories about the transport of plant seeds to Hawaii." Choice A can be eliminated: while the passage does refer to flotation experiments, it does not elaborate on experimental methods. Choice C identifies an idea that is part of the passage’s main concern, but since this is only one of the competing theories discussed in the passage, not the primary focus, Choice C is incorrect. Choices D and E are incorrect because the passage does not resolve any disputes.
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