单选题
This is a story about ______.
A、
a useless advertisement
B、
how to make an effective advertisement
C、
how the man lost and found his umbrella
D、
what the merchant did for the umbrella owner
【正确答案】
B
【答案解析】
文章讲述了通过前后两个不同的广告所得的不同效果。
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