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
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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
Which of the following is NOT true
A．Crude oil is found below land and water.
B．Crude oil is always found a few hundred feet below the surface.
C．Pumping and pressure force crude oil to the surface.
D．A variety of petroleum products is obtained from crude oil.
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