题目

R是△ABC三角形的外接圆半径，若ab＜4R2cosAcosB，则∠C为（ ）A.锐角       B.直角       C.钝角       D.无法判断 答案：.C    My mother opened the drawer to ______ the knives and spoons.A.put awayB.put upC.put onD.put together