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在单链表中，要删除一个指定的结点，必须要找到该结点的______。

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设有如下关系表R：R(NO,NAME,SEX,AGE,CLASS)主关键字是NO其中NO为学号(数值型)，NAME为姓名，SEX为性别，AGE为年龄，CLASS为班号。写出实现下列功能的SQL语句。将学号为10的学生姓名改为"王华"；______。

Marriage is still a popular social practice in America, but divorce is becoming almost as "popular". Most Americans get married, but at the same time, fifty percent of their marriages end up in divorce. However, four out of five divorced people do not stay single. They get married for the second time to new partners. Sociologists tell us that in the 21st century, most American people will marry three or four times in one lifetime. Alvin Toffier, an American sociologist, calls this new social form social marriages. In his book Future Shock, Toffier gives many reasons for this change in American marriage. In modem society, people’s lives don’t stay the same for very long. Americans frequently change their jobs ,their homes, and their circle of friends. So the person who was a good husband or wife ten years ago is sometimes not as good ten years later. After being married for some years, a husband or wife can feel that their lives have become very different, and they don’t have the same interests any more. Because of this, Toffier says,people in the 21st century will not plan to marry only one person for an entire lifetime. They will plan to stay married to one person for perhaps five or ten years, and then marry another. Most Americans will expect to have a "marriage career" that includes three or four marriages.The divorce rate in America has reached________________________________6In the 21st century, most Americans will marry three or four times_7Alvin Toffler published a book named_________________________8The percentage of remarriage among divorced Americans is_9One of the reasons for the change in American marriages is_________10 10().

Copemicus(哥白尼)showed that, ______(远非宇宙的中心), the earth is just one of many small worlds.

能够存放图片或声音的字段类型为______型。