2. 外语
  3. The passage is primarily concerned with______ According to the passage, investigations of eukaryotic and prokaryotic cells at t

The passage is primarily concerned with______ According to the passage, investigations of eukaryotic and prokaryotic cells at t

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问题 The passage is primarily concerned with______
According to the passage, investigations of eukaryotic and prokaryotic cells at the molecular level supported the conclusion that______
选项 A、most eukaryotic organisms are unicellular
B、complex cells have well-formed nuclei
C、prokaryotes and cukaryotes form two fundamental categories
D、subcellular structures are visible with a microscope
E、prokaryotic and eukaryotic cells have similar enzymes
答案C
解析 The best answer is C. In lines 10-20, the passage states that, although molecular investigation revealed some similarities between prokaryotic and eukaryotic cells, “the differences between the groups and the similarities within each group made it seem certain to most biologists that the tree of life had only two stems” (lines 18-20)-that is, “two fundamental categories,” as C asserts. The passage does not address what proportion of eukaryotic organisms are unicellular (choice A) or whether all complex cells have well-formed nuclei (choice B). That “sub cellular structures are visible with a microscope” (choice D) is described as established “initially”-that is, before the research was “ultimately carried to the molecular level” (lines 7-10). According to the passage, molecular investigation supports the idea that “sequences of …enzymes tend to be typically prokaryotic or eukaryotic”-not that those enzymes are similar (lines 16-17), as E claims.
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