单项选择题

It is implied about Trevor Baylis that ______.

A．he invented the clockwork radio
B．he runs a race
C．he was once a singer
D．he is in charge of a swimming pool
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单项选择题
According to the passage, Poseidon saves a life by ______.
A．plunging into the pool
B．alerting the lifeguard
C．crying for help
D．rushing to the pool
单项选择题
It is implied in the passage ______.
A．measles is not usually a fatal disease
B．measles ceased to be problem by the seventeenth century
C．measles is the disease most commonly involved in virgin-soil epidemics
D．measles was not a significant problem in Spanish colonies
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