题目内容
The woman president is her mother.
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The bag is red and yellow.
Complete the sentences with words or expressions （选词填空完成句子）.luxuryfree fromrich inin the wildcontain1 Fruit and vegetables are_________vitamins.2 Sara’s parents have a lot of money. She is used to living in__________ .3 Organic milk is very good for babies because it’s__________ pesticides.4 I don’t think people should keep pets, because animals are happier __________.5 This product may__________milk and eggs.
在一个图中，每个顶点的前驱顶点和后继顶点数可以有_____。
在一个具有n个顶点的无向连通图中至少有_____条边。
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