单项选择题

After “9.11”, the Olympic Games severely taxed the security services of the host country.

A．improved
B．burdened
C．inspected
D．tariffed
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单项选择题
Christmas shoppers should be aware of the possible defects of the products sold at a discount.
A．deficits
B．deviations
C．drawbacks
D．discrepancies
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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