题目

 The ____________ shoes were covered with mud, so I asked them to take them off before they got into __________ car.  A. girl’s; Tom’s    B. girls’; Toms’   C. girls’; Tom’s     D. girl’s; Toms’ 答案：C 本题考查名词所有格形式。根据题干后半部分的them可知对应复数girls。（2013•天津）已知函数．（1）求f（x）的最小正周期；（2）求f（x）在区间上的最大值和最小值．