题目

Don't touch the sleeping tiger. If he woke up, he _____ you. A. would come to B. would come at C. would have come toward   D. will come to 答案：B设数列{an}满足a1=2， ；数列{bn}的前n项和为Sn ， 且 ． （Ⅰ）求数列{an}和{bn}的通项公式；（Ⅱ）把数列{an}和{bn}的公共项从小到大排成新数列{cn}，试写出c1 ， c2 ， 并证明{cn}为等比数列．