[解析]
(1)细节理解题。根据第一段 Jack is a twenty﹣year﹣old young man.Two years ago,when he finished middle school,he found a job in a shop.(杰克是一个20岁的年轻人。两年前,他中学毕业后,在一家商店找到了一份工作。)可知20的时候毕业两年了,所以是18岁毕业,故选B。
(2)推理判断题。根据第一段After a quick supper he goes to bed and soon falls asleep.His grandma who lives downstairs is satisfied (满意的) with him.(匆匆吃过一顿晚饭,他就上床睡觉,很快就睡着了。住在楼下的奶奶对他很满意。)可推知他奶奶对他满意是因为他保持安静,故选C。
(3)细节理解题。根据第二段And they talked about their school,teachers,classmates and their future.They talked for a long time.(他们谈论了他们的学校、老师、同学和他们的未来。他们谈了很长时间。)可知他们两个是同学,故选A。
(4)词义猜测题。根据倒数第三段He began to stamp his foot on the floor,"Bang !Bang !Bang!"(他开始在地板上跺脚,"砰!砰!砰!")可知发出砰!砰!砰的声音,应该是在跺脚,故选B。