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  3. Fossils are the remains and traces of ancient plant and animal lives that are more than 10,000 years old. They range in size fro

Fossils are the remains and traces of ancient plant and animal lives that are more than 10,000 years old. They range in size fro

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问题      Fossils are the remains and traces of ancient plant and animal lives that are more than 10,000 years old. They range in size from microscopic structures to dinosaur skeletons and complete bodies of enormous animals. Skeletons of extinct species of human are also considered fossils.
     An environment favorable to the growth and later preservation of organisms is required for the occurrence of fossils. Two conditions are almost always present: The possession of hard parts, either internal or external, such as bones, teeth, scales, shells, and wood; these parts remain after the rest of the organism has decayed. Organisms that lack hard parts, such as worms and jelly fish have left a meager geologic record. Quick burial of the dead organism, so that protection is afforded against weathering, bacterial action, and scavengers.
     Nature provides many situations in which the remains of animals and plants are protected against destruction. Of these, marine sediment is by far the most important environment for the preservation of fossils, owing to the incredible richness of marine life. The beds of former lakes are also prolific sources of fossils. The rapidly accumulating sediments in the channels, floodplains, and deltas of streams bury fresh-water organisms, along with land plants and animals that fall into the water. The beautifully preserved fossil fish from the Green River soil shale of Wyoming in the western Unit- ed States lived in a vast shallow lake.
     The frigid ground in the far north acts as a remarkable preservative for animal fossils. The woolly mammoth, a long-haired rhinoceros and other mammals have been periodically exposed in the tundra of Siberia, the hair and red flesh still frozen in cold storage.
     Volcanoes often provide environments favorable to fossil preservation. Extensive falls of volcanic ash and coarser particles overwhelm and bury all forms of life, from flying insects to great trees. Caves have preserved the bones of many animals that died in them and were subsequently buried under a blanket of clay or a cover of dripstone. Predatory animals and early humans alike sought shelter in caves and brought food with them to the eater, leaving bones that paleontologists have discovered.
Which of tile following is LEAST likely to be found as a fossil, assuming that all are buried rapidly ?
选项 A、a dinosaur.
B、a woolly mammoth.
C、a human ancestor.
D、a worm.
答案C
解析 本题是一个推断题，文章中的对应表述在倒数第二段。文章中倒数第二段提到了“all forms of life”，因此ABD 都没有理由排除。但是C：人类祖先这一项在最后一段进行了特别的说明，因此可以推测作者在这以前的表述中是没有考虑人类的，因此答案选C．
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