单项选择题

A．In San Francisco.
B．In a plane.
C．At a railway station.
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How many tablets should a nine-year-old child normally take in 24 hours
A．Half a tablet.
B．One tablet.
C．Three tablets.
D．Four tablets.
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Which statement does this passage lead you to believe
A．It won't be easy to get rid of the tsetse flies in Africa.
B．Sleeping sickness is unknown to Africans.
C．People did not know sleeping sickness could cause deaths.
D．The people there did not know the tsetse carried a kind of disease to man.
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