单项选择题
It can be inferred from the passage that a scientist devoted himself to study the nature of the carbon dioxide likely belongs to those dedicated to______.
单项选择题 The word "hypotheses" (Line 3, Para. 2) can probably be replaced by______.
单项选择题 After reading the passage, we can learn the author intent to imply
单项选择题 The example of the invention of a microscope demonstrates that pure science______.
