单项选择题

While the male bird was dancing ______.

A．he showed off his tail feathers
B．he shook leaves off the tree
C．he threw away some feathers
D．he cried more frequently
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单项选择题
Soon after the two hen birds had arrived______.
A．they settled down with the male
B．the male drove one of them off
C．they make unmusical cries like the male
D．they lost interest in the male
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
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