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  3. Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded t

Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded t

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问题    Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do. He finally concluded that the constituent 【C1】______ must exist in the form of tiny particles or atoms and that these  【C2】______  be completely mixed together in the atmosphere. This threw a new light in 【C3】______  law of definite proportions. It was only necessary to suppose that the atoms 【C4】______  combine into small groups of uniform  【C5】______  and so form more complex substance;  【C6】______  the mystery of this law was  【C7】______ . Dalton suggested, for example, that carbon monoxide 【C8】______  formed by the one with one  【C9】______  of atoms of carbon and oxygen, 【C10】______  carbon dioxide results from a single 【C11】______  of carbon uniting with two atoms of oxygen. Assuming this to be true,  【C12】______  the definite proportions of Prout’s law 【C13】______  all chemical compounds the different constituents 【C14】______  enter in unvarying proportions would naturally 【C15】______  the relative weights of the many different kinds of atoms.
【C6】______
选项 A、but
B、also
C、thus
D、nevertheless
答案C
解析  but，nevertheless表示转折意为“但是”，“然而”；thus意为“因此”，如There has been no rain．Thus，the crops are likely to suffer．一直没有下雨，因此庄稼可能会受害。这里与上文有因果关系，故应选C。
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