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
The writer of this passage wanted to______.
A．take a photograph of the bird
B．make a recording of the bird' s calls
C．catch the bird
D．watch the sunrise
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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