2. 外语
  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  【C2】______particles or atoms and that these【C3】______be completely mixed together in the【C4】______. This threw a new light in【C5】______laws of definite proportions. It was  【C6】______necessary to suppose that the atoms【C7】______combine  into small groups of uniform【C8】______and so form more complex substance;【C9】______the mystery of this law was【C10】______. Dalton suggested, for example, that carbon monoxide【C11】______formed by the one with one【C12】______of atoms of carbon and oxygen,【C13】______carbon dioxide results from a single【C14】______of carbon uniting with two atoms【C15】______oxygen. Assuming this to be true,【C16】______the definite proportions of Prout’ s law (【C17】______all chemical compounds the different constituents【C18】______enter in unvarying  proportions) would naturally【C19】______the relative weights of the many【C20】______kinds of atoms.
【C7】
选项 A、should
B、were
C、get
D、could
答案D
解析 根据句子意思判断，could是“能够”的意思。suppose“假设”，不用虚拟形式，故其引导的从句不应用 should+动词原形。were后面的动词combine应为combining, get后不可以直接接动词，所以只有 could符合语意和语法。
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大学英语四级

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