单项选择题

It is believed that the Black Death, rampant in the Medieval Europe __________, killed 1/3 of its population.

A．at large
B．at random
C．on end
D．on average
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单项选择题
Officials from the Department of Agriculture confirmed that the __________ floods and drought this summer did not affect the country’s grain output.
A．rippling
B．waning
C．fluctuating
D．devastating
单项选择题
Web portal Sohu has gone a step further and called for netizens to join in an all-out boycott of __________ content.
A．wholesome
B．contagious
C．vulgar
D．stagnant
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