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【单选题】
如果有人告诉你物品X和Y的无差异曲线向上倾斜，你对这种说法的反应是：A.
该消费者的收入一定增加了。
B.
这是不可能的，因为如果是这样的话，该消费者就不会从物品X和Y中得到满意度了。
C.
可能表明该消费者对于这两种物品漠不关心。
D.
两种物品当中肯定有一种的价格发生了变化。
E.
这表明当消费者多消费1单位X时，如果保持效用不变，他(或她)肯定要多消费Y。
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举一反三
【单选题】After school we went to the reading-room to do some reading, only to be told that it .
A.
was decorated
B.
had decorated
C.
had been decorated
D.
was being decorated
【单选题】After school we went to the readingroom to do some reading，only to be told that it ________.(2012·安徽)
A.
was decorated
B.
had decorated
C.
had been decorating
D.
was being decorated
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