单项选择题

The most important advances made by mankind come from ______.

A．apparently useless information
B．the natural sciences
C．philosophy
D．technical applications
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单项选择题
The practical scientist ______.
A．is a philosopher
B．is interested in the unknown
C．knows the value of what he will discover
D．knows that the world exists
单项选择题
Who first hinted at the possible cause of childhood leukaemia by infection
A．Leo Kinlen
B．Richard Doll
C．Louise Parker
D．Heather Dickinson
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