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  3. It is animals and plants which lived in or near water whose remains are most likely to be preserved, for one of the necessary co

It is animals and plants which lived in or near water whose remains are most likely to be preserved, for one of the necessary co

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问题     It is animals and plants which lived in or near water whose remains are most likely to be preserved, for one of the necessary conditions of preservation is quick burial, and it is only in the seas and rivers, and sometimes lakes, where mud and silt have been continually deposited, that bodies and the like can be rapidly covered over and preserved.
    But even in the most favorable circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them. After all, all living creatures live by feeding on something else, whether it be plant or animal, dead or alive, and it is only by chance that such a fate is avoided. The remains of plants and animals that lived on land are much more rarely preserved, for there is seldom anything to cover them over. When you think of the innumerable birds that one sees flying about, not to mention the equally numerous small animals like field mice and voles which you do not see, it is very rarely that one comes across a dead body, except, of course, on the roads. They decompose and are quickly destroyed by the weather or eaten by some other creatures.  
The best title for this passage is ______.
选项 A、The Origin of Life on Earth
B、Life Forms on Earth
C、The Discovery of Life on Earth
D、The Preservation of the Past Life on Earth
答案D
解析 本题属主旨判断题。通读全文之后，便知作者的目的是：生物死后的保护问题，并非A生命起源，B生命形式和C生命的发现。
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