单项选择题

A．He failed his last test.
B．He can’t find his watch.
C．He’s taking examinations soon.
D．He missed his medical checkup.
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单项选择题
Studies of the lives of eminent persons show that their successes can be attributed to all the following EXCEPT ______.
A．careful studies of the work of their forerunners
B．complete involvement in the previous work in their fields
C．very early exposure to basic knowledge and various activities
D．total concentration on the work done previously
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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