2. 职称英语
  3. It is estimated that by 2020 the concentration of carbon dioxide will be nearly

It is estimated that by 2020 the concentration of carbon dioxide will be nearly

游客2023-12-26  8
问题 It is estimated that by 2020 the concentration of carbon dioxide will be nearly twice and it is now.
选项 A、twice than it is
B、that it is twice
C、than it is twice
D、twice what it is
答案 D
解析 本题重点考查比较表达式的用法。画线部分在倍数词后面出现了一个并列句，其意思与前面一句无法衔接。前面说据估计到2020年时二氧化碳的浓度几乎会翻一番，而后面一句却是现在就翻一番了，前后矛盾。四个选项中排除A、B和C选项，因为它们不是正确的比较表达式。在表达比较时，引导比较状语从句的连词主要是as和than，还有倍数词后面加比较级的形容词或副词再跟上一个than引导的比较从句，或倍数词后面跟上一个名词性从句等。故选D。twice what it is=twice the thing that it is。
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