单项选择题

The bird began to dance______.

A．as soon as they saw him
B．as soon as he had finished cleaning himself
C．as soon as he settled down
D．some time after they first saw them
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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
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.
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