第3题: [单项选择]9,30,69,132,225,()。 A. 354 B. 387 C. 456 D. 540 参考答案:A 答案解析:[解析] 观察发现,题干数列分别为23+1、33+3、43+5、53+7、63+9,列式前一项为连续立方数列,后一项为连续奇数列,则______处应为73+11=354。因此,本题选A。
第17题: [单项选择]What kink of effect do calories have on your body A. They make you become fatter. B. They help to keep you alive. C. They make you become thinner. D. They change your eating habit. 参考答案:B