单项选择题

The safty debate is now focused on protection of ______.

A．the spectators and officials
B．the cars
C．the sports stars
D．All of the above
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单项选择题
According to this passage, the best tasting Pike is ______.
A．better for age and size
B．bred from pickerel weed
C．middle -sized
D．taken in summer
单项选择题
What had been the main factor preventing the development of battery buses
A．Their limited range.
B．Their high cost.
C．Their heavy weight.
D．Their loud noise.
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