单项选择题

What is the author's view of "instant" scientific discoveries

A．They occur with long intervals.
B．They occur in quick succession for a long period.
C．They require long periods of time to be confirmed.
D．They are never made easily, but through long years of intense work and persistence.

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单项选择题

The passage says that in the 1960s it was a widespread belief that distinguished scientific accomplishments were ______.

A．made mostly by accident
B．the results of painstaking efforts
C．the results of sudden bursts of creativity
D．made only by distinguished characters

单项选择题

According to the passage, which of the following is of primary importance in becoming successful in the scientific fields

A．The development of literacy.
B．The degree of problem-solving approaches.
C．Opportunity and concentration.
D．The processing capacity of the mind.