2. 外语
  3. The macromolecule RNA is common to all living beings, and DNA, which is found in all organisms except some bacteria, is almost a

The macromolecule RNA is common to all living beings, and DNA, which is found in all organisms except some bacteria, is almost a

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问题 The macromolecule RNA is common to all living beings, and DNA, which is found in all organisms except some bacteria, is almost as________.
选项 A、mercurial
B、amorphous
C、ubiquitous
D、manifest
E、exiguous
答案C
解析 解题点在于空格前的as，这里的意思为“同样地”，表示指代，所以空格中的内容一定是前面出现过的。前面说RNA is common to au living beings(在所有的活体生物中都很普遍)，后面说DNA几乎也是同样地________，所以空格应该填入一个表示common to all的类似概念。综上，选择C项ubiquitous。
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