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
Many thousands of hydrocarbon compounds are possible because______.
A．the petroleum products vary greatly in physical appearance
B．complicated refining processes rearrange the chemical structure
C．the two atoms in the molecule assume many positions
D．the pressure needed to force it to the surface causes molecular transformation
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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