题目

. After the terrorist attack last month, anyone at the airport       heavy bags, bottles of liquid, or whatever, could be stopped and questioned by the police. A. seen carrying                      B. seen carry      C. seen to carry                       D. seen to be carrying 答案：A将2，3，4，5…n（n为大于4的整数）分成两组，使得每组中任意两数之和都不是完全平方数．那么，整数n可以取得的最大值是______．