单项选择题

The particular bird they were watching______.

A．danced with the two hen birds
B．fell off a branch
C．was afraid of the two hen birds
D．cleaned himself in frequency
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单项选择题
Which of the following is NOT listed as a light oil
A．Gasoline.
B．Kerosine.
C．Distillate oil.
D．Diesel oil.
单项选择题
Which of the following is NOT true
A．Crude oil is found below land and water.
B．Crude oil is always found a few hundred feet below the surface.
C．Pumping and pressure force crude oil to the surface.
D．A variety of petroleum products is obtained from crude oil.
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