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
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单项选择题
It can be inferred from the passage that ______.
A．Trevor Baylis will install all the swimming pools in local areas
B．Trevor Baylis calls on the local government to build more swimming pools
C．Trevor Baylis tries to persuade the local government to use a Poseidon system
D．Trevor Baylis is teaching children to swim
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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