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【单选题】
疫源地是指A.
传染源能达到的范围
B.
传染源所在的地区
C.
传染源容易聚集的地方
D.
传染源向四周传播病原体所能波及的范围
E.
易感者聚集的地方
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【单选题】Which of the following is false about quantity discounts?
A.
Quantity discounts are a form of price discrimination which allow a seller to charge a higher price for the first unit than for later units.
B.
Quantity discounts allow price discriminating producers to extract additional consumer surplus from customers.
C.
Price discrimination, such as offering quantity discounts, can result in a greater output, and thus greater consumer surplus and producer surplus, by a monopolist than if price discrimination was not possible.
D.
Quantity discounts benefit those customers who would not buy any of a monopolist's product at the price that the monopolist would charge if it could not price discriminate.
【单选题】To get people buying, many stores are running their usual sales offering discounts(打折)as high as 50 percent, hoping that shoppers don't repeat past habits by waiting for post-Christmas .
A.
bargains
B.
fancies
C.
decorations
D.
expectations
【简答题】人体最大的解毒器官是（ ）。
【简答题】目前,我国常见的国产轿车均采用( )。
【单选题】To get people using, many stores are running their usuals offering discounts as high as 50 percent, hoping that shoppers don’t repeat past habits by waiting for post- Christmas __ .
A.
festival
B.
season
C.
shopping
D.
bargains
【简答题】人体最大的解毒器官是（ ）。
【简答题】介副词填空 After the earthquake, many stores have been reaching ______ the poor by offering food and clothing at big discounts.
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