单项选择题

Helen Keller is remembered as （）

A．a political leader.
B．an example to others.
C．a famous scientist.
D．an extraordinary doctor.

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单项选择题

After some experiments, the doctors found that （）

A．the influenza could be cured like other types of influenza
B．the influenza must be treated in a special way
C．the influenza did not have to be treated
D．the influenza could not be cured by any known medicine

单项选择题

Fly ash can partly take the place of （）

A．paving material
B．cement
C．concrete
D．the coal by-product