未分类题

How to Get Preserved as a Fossil
【S1】 Unfortunately the changes of any animal become a fossil are not very great, and 【S2】 the chances of a fossil then being discovered many thousand of years later are even less. 【S3】It is not surprising that all the millions of animals that have lived in the past. 【S4】we actually have fossils of only very few.
【S5】There are several ways into Which animals and plants may become fossilized.【S6】First, it is essential that the remains are buried, as though dead animals and planks are quickly destroyed 【S7】 if they remain exposed the air. Plants rot, while insects and hyenas eat the flesh and bones of animals. 【S8】Finally, the few remaining bones soon disintegrate the hot sun and pouring rain. If buried in suitable conditions, however, animal and plant remains will be preserved. 【S9】The same chemicals change sand and silt into hard rock will also enter the animal and plant remains and make them hard too. 【S10】When this happens, we say that they become fossilized.
【S1】

A.
B.【S6】First,
C.
【S1】


【参考答案】

become→becoming
become→becoming 解析：该句主句是The chances are not very great．因此become不能用原形，只能用现在分词形式表补充说明。
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