单项选择题

The purpose of removing difficult words in the examples is to （）

A．make them easier to understand
B．provide more useful words
C．introduce more contexts
D．include more examples

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（）购买力；（）商业风险

单项选择题

A．The first Sunday of each month.
B．Every day from 10 am to 3 pm.
C．The first day of each month.
D．Every weekend in winter.