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 TRUE
A．The various petroleum products are produced by filtration.
B．Heating and condensation produce the various products.
C．Chemical separation is used to produce the various products.
D．Mechanical means such as the centrifuge are used to produce the various products.
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.
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