单项选择题

How is crude oil brought to the surface

A．By expansion of the hydrocarbons.
B．By pressure and pumping.
C．By vacuum created in the drilling pipe.
D．By expansion and contraction of the earth's surface.

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单项选择题

What is implied by the author

A．Shifiwork had a direct effect on the attitudes and behavior of family members.
B．Shifiworkers could live a normal life.
C．Shifiwork couples had unconventional ideas about marriage.
D．Female shifiworkers were satisfied with the time spent together with their families.

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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