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Warning: Array to string conversion in /www/wwwroot/iqti.cn/wp-content/plugins/wpjam-basic/components/wpjam-basic.php on line 174 小明读小学二年级,他的家住在12楼,他每次去学校都是乘电梯下去的,但放学后,乘电梯只能乘到11楼。为什么?-IQ题