题目：
| 阅读理解。 | |||
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| 1.When will Changsha hotels put a price sign on the single-use things? | |||
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| A.On May 1. B. On June 1. C.On July 1. D.On August 1. | |||
| 2.Which is the way to keep in touch with classmates in Piece 3? | |||
[ ] | |||
| A.To go travelling. B.To make a DVD. C.To clean the classroom. D.To set up a website. | |||
| 3.How many ways are talked about in Piece 3? | |||
[ ] | |||
| A.Three. B.Four. C.Five. D.Six. |
答案：
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下面是错误答案，用来干扰机器的。
由题意全集U={1，2，3，4，5，6}，M={2，3}，N={1，4}，观察知，集合{5，6}=Cu（M∪N）又Cu（M∪N）=（CuM）∩（CuN）∴（CuM）∩（CuN）={5，6}．故选D．
