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.
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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
Despite ______,shiftwork couples still hoped to maintain a stable life.
A．traditional beliefs about marriage
B．lack of control over time
C．a very clear division of roles
D．the demands of work
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