第2题: [单项选择]143,59,25,9,7,______。 A. -2 B. -3 C. -4 D. -5 参考答案:D 答案解析:[解析] 递推数列。第n项减去第n+1项的2倍等于第n+2项(n≥1)。即143-2×59=25,59-2×25=9,25-2×9=7,9-2×7=(-5)。故本题选D。
第24题: [单项选择]Henry Tanner received widespread recognition for his naturalistic paintings of plantation life. A. profits B. storage C. attention D. invitations 参考答案:C