单项选择题

A．Before summer vacation,
B．During summer vacation.
C．After summer vacation.
D．In class.
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单项选择题
A．His job is difficult.B．His job isn’t interesting.C．He doesn’t know how to do his job.D．He doesn’t sleep well at night.
A．His job is difficult.
B．His job isn’t interesting.
C．He doesn’t know how to do his job.
D．He doesn’t sleep well at night.
单项选择题
How many lives could probably be saved each year in the United States by eating fish according to the Dutch study
A．550,000.
B．275,000.
C．110,000.
D．852.
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