单项选择题

The passage is mainly about

A．Christmas sales.
B．retailing business.
C．Internet population.
D．online shopping.
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单项选择题
This is a letter of
A．inquiry.
B．complaint.
C．explanation.
D．introduction.
单项选择题
The author seems to indicate that
A．there are many controversial issues like the right amount of sleep.
B．among many issues the right amount of sleep is the least controversial.
C．people are now moving towards solving many controversial issues.
D．the right amount of sleep is a topic of much controversy among doctors.
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