(2010·安徽师大附中高三第二次模拟考试) 34. —Hi, Johnson, any idea where Susan is? —It’s class time, so she ______ in the classroom now. A. can be B. must have been C. might have been D. should be 答案:D已知△ABC的三边长分别为a,b,c,且其中任意两边长均不相等,若,,成等差数列. (1)比较与的大小,并证明你的结论; (2)求证:角B不可能是钝角.