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  3. Which of the following is true of the environments in which fossils are found? The fossil fish from the Green River(Paragraph 3

Which of the following is true of the environments in which fossils are found? The fossil fish from the Green River(Paragraph 3

admin2009-04-27  71
问题 Which of the following is true of the environments in which fossils are found?
The fossil fish from the Green River(Paragraph 3) were probably preserved because they were
选项 A、in a deep lake.
B、covered by sediment.
C、protected by oil.
D、buried slowly.
答案B
解析 推理判断题。第三段第二句指出"其中，由于海洋生物极其丰富，海洋沉淀物是形成、保护化石的最重要的环境"。这里作者指出了有利于化石形成的一种环境。接下来，作者举例说明这点：以前湖泊的河床也是化石的丰富来源。渠道、洪水淹没的平原，以及河流的三角洲地区快速累积的沉淀物把掉进水里的动植物及淡水有机物都埋在了地下。作者在该段最后提到了绿河中的鱼类，依据英语文章结构可知，细节是为主旨服务的，因此可以推出这个例子也是为了说明该段论点的，即可以判断出这些鱼类化石的形成可能也是由于"沉淀物掩埋"。
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