单项选择题

Water and air are ().

A、fluids
B、streams
C、floats
D、flows
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单项选择题
I hope John would give me some ()of what he would like for his birthday.
A、clue
B、hint
C、implication
D、inference
单项选择题
They have had three ()days of heavy rain.
A、continual
B、running
C、gradual
D、successive
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