题目内容
Jim was my brother-in-law. He was (1) a toothache last week. But he didn’t want to see a doctor. Finally, (2) ,my mother-in-law decided that she would go and see the doctor herself. She carefully (3) {that although her son had a lot of pain, he was refusing to get treatment. Her son was (4) doctors. The nurse told her that they were used to dealing with this (5) tear and would be able to fit jim in right away. "How old is your little boy" she asked. My mother-in-law replied, "He’s 40 years old." 5（）
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Who studies hardest 10（）
对有14个结点的完全二叉树的结点以从上至下、从左至右的顺序进行编号后，序号最小的叶结点的序号为______。
若一棵二叉树中只有叶结点和左、右子树皆非空的结点，设叶结点的个数为R，则左、右子树皆非空的结点个数是______。
Vending machines(自动贩卖机) sell many different types of items. Some of them sell cold drinks like soda, or hot drinks like coffee or hot chocolate. Others sell candy, stamps, tickets, news papers, and other types of small merchandise.These machines have been successful for two reasons. They save time and they are convenient.. Merchandise sold in machines eliminates the need for a salesclerk or cashier. In many places the customer can use the machines at any time of day or night.Although there are many different size and types of vending machines, they all work basically the same way. The customer puts a coin in the machine and then pushes a button, pulls a lever, or opens a door to receive the merchandise. Some machines will also return change to the customer for paper money. But the basic idea is the same. Customers like to save time and are usually willing to pay a higher price for this convenience.The sale of snacks in vending machines has always been very successful. However, machines now sell hot meals with only limited success. In New york City, automats used to sell a lot of hot foods in vending machines. But in recent years, fast food establishments have replaced automats.Vending Machine Vending machines have been popular because they are (1) , and convenience. (2) and paper money alike must be fed into a vending machine before you can receive merchandise. Vending machine can be used at any time of the day and night since they don’t need any sales clerk or (3) . Automats are now successful in the sale of (4) . In order to save time customers are usually willing to (5) for this convenience. 2（）
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