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
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
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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