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单项选择题


What do economists think of working hours in Asia

A．They don’t think that the working hours need reducing.
B．They think that a flexible working schedule is also desirable.
C．They think that working hours have declined satisfactorily.
D．They believe the flexible working hours benefit workers only.
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单项选择题How many people were missing in the storm of July 17 that drenched North Korea

A．549.
B．151.
C．295.
D．29.

单项选择题According to the passage, what would happen to healthy cells within 48 hours of exposure to radio waves

A．The number of healthy cells will keep declining as more and more of them die.
B．The number of healthy cells will initially drop before recovering rapidly.
C．The number of healthy cells will be on steady increase throughout the process.
D．The scientists have not yet arrived at any conclusion on this issue.