根据网考网考试中心的统计分析，以下试题在2019/2/21日在职申硕英语考试习题练习中，答错率较高，为：54%
【单选题】
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{{U}} (61) {{/U}}must exist in the form of tiny particles or atoms and that these{{U}} (62) {{/U}} be completely mixed together in the atmosphere. This threw a new light in {{U}} (63) {{/U}}law of definite proportions. It was only necessary to suppose that the atoms {{U}} (64) {{/U}}combine into small groups of uniform{{U}} (65) {{/U}}and so form more complex substance;{{U}} (66) {{/U}}the mystery of this law was{{U}} (67) {{/U}}.Dalton suggested, for example, that carbon monoxide {{U}} (68) {{/U}}formed by the one with one{{U}} (69) {{/U}} of atoms of carbon and oxygen, {{U}} (70) {{/U}}carbon dioxide results from a single {{U}} (71) {{/U}}of carbon uniting with two atoms of oxygen.Assuming this to be true,{{U}} (72) {{/U}}the definite proportions of Prout’s law {{U}} (73) {{/U}}all chemical compounds the different constituents {{U}} (74) {{/U}}enter in unvarying proportions would naturally {{U}} (75) {{/U}} the relative weights of the many different kinds of atoms.
A．then
B．so
C．by
D．that
网考网参考答案：A，答错率：54%
网考网试题解析：then的意思是next，after that。
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