A: Who's that ____( boy / girl) ?
B: He's my brother.
A: Is the ____( man / woman) your mother?
B: Yes, she is.
A:____ (What's / Who's) that man?
B: Guess.
A: Is ____( he / she) your father?
B: No, he isn't.____ (She's / He's ) my teacher.
（Ⅰ）求证：数列logman=2n+2，{an}是等比数列；
（Ⅱ）若bn=anf（an），记数列{bn}的前n项和为Sn，当m= 2 时，求Sn．
横线上最大能填几？
____×4＜29 34＞5×____ 7×____＜30 81＞9×____
____×8＜55 60＞____×9 ____×6＜38 3×____＜27
