2. 外语
  3. By studying the primitive visual systems of single-cell aquatic organisms, biophysicists have discovered a striking similarity b

By studying the primitive visual systems of single-cell aquatic organisms, biophysicists have discovered a striking similarity b

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问题 By studying the primitive visual systems of single-cell aquatic organisms, biophysicists have discovered a striking similarity between algae and cows, a similarity that indicates the common evolutionary origin of plants and animals: both algae and cows produce a light-sensitive protein called rhodopsin.
选项 A、biophysicists have discovered a striking similarity between algae and cows
B、a striking similarity between algae and cows has been discovered by biophysicists
C、there is a striking similarity that biophysicists have discovered between algae and cows
D、the discovery of a striking similarity between algae and cows was made by biophysicists
E、algae and cows have a striking similarity that was discovered by biophysicists
答案A
解析 在5个选项中，仅有A中的scientists可作studying的逻辑主语，需要指出的是，在划线部分之后，通过重复a similarities，对前面的a striking similarities作同位解释说明。
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