单项选择题

Which of the following is NOT mentioned about scientists in earlier times（）

A．They invented false theories to explain things they didn't understand.
B．They falsely claimed to know all about nature.
C．They did not believe in results from scientific observation.
D．They paid little attention to the problems they didn't understan

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单项选择题

What is the author's attitude towards science（）

A．He is depressed because of the ignorance of scientists.
B．He is doubtful because of the enormous difficulties in scientific research.
C．He is confident though he is aware of the enormous difficulties in scientific research.
D．He is delighted because of the illuminating scientific findings.

单项选择题

It can be inferred from the passage that scientists of the 18th century（）

A．thought that they knew a great deal and could solve most problems of science
B．were afraid of facing up to the realities of scientific research
C．knew that they were ignorant and wanted to know more about nature
D．did more harm than good in promoting man's understanding of nature