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

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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

单项选择题

This passage is mainly about ______.

A．the cluster of leukaemia cases around the Sellafield nuclear reprocessing part
B．the kind of infection that causes childhood leukaemia
C．the causes of childhood leukaemia
D．a new finding by British scientists

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