本例最可能的诊断是
A．盆腔炎性包块B．输卵管结核C．卵巢子宫内膜异位囊肿破裂D．子宫浆膜下肌瘤扭转E．卵巢肿瘤蒂扭转
参考答案：E
根据句子的意思，补全单词。
1. The little boy often _ _ to sleep on the bus when he sees old men beside him.
2. The little girl has up all her money so she has to walk home.
3. Because your brother is a boy, his friends won't believe in him any more.
4. Can you _ the big stone without any help?
5. Some thieves to escape from the police station, but they failed at last.
集合M＝{a，b，c}，N＝{－1,0,1}，映射f：M→N满足f(a)＋f(b)＋f(c)＝0，那么映射f：M→N的个数是多少？
