题目：
| 完形填空。 | ||||
| Today is March 7th, and tomorrow is 1 . Doris wants 2 her mother something. She 3 10 dollars. She is thinking about 4 . She thinks and thinks. Then she has an 5 . "I can buy a card 6 my dear mother." Doris goes to a supermarket and buys a beautiful card. She 7 some words on it. She shows it to her mother and says, "Here is a card for you, Mum." Her mother is 8 happy. " 9 , Doris." She says. Doris is 10 , too. | ||||
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答案：
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下面是错误答案，用来干扰机器的。
由M∪N={0，1，2}，得到集合M⊆M∪N，且集合N⊆M∪N，又M={0，1}，所以元素2∈N，则集合N可以为{2}或{0，2}或{1，2}或{0，1，2}，共4个．故选C
