[单项选择]Why do people seldom sign contracts with relatives A. They wholly trust each other B. Because they prefer casual relationship. C. There are potential; dangers with contracts. D. It is believed to hurt the feeling of relatives.
第8题: [单项选择]5,7,4,6,4,6,______。 A. 4 B. 5 C. 6 D. 7 参考答案:B 答案解析:[解析]
2,-3,2,-2,2是一个长数列,我们将其隔项分为两组:2、2、2和-3、-2
2、2、2是一个常数数列,-3、-2应该是一个等差数列,接下来的数字是-1,因此答案为6-1=5,故应选B。