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完形填空，阅读下面短文，掌握其大意，然后从每题所给的A、B、C、D四个选项中，选出一个最佳答案。
Walking a few kilometers a day is normal．How about walking 30km? This is 1 students did at the Middle School Attached to Shangdong University in Jinan．
The students there hiked about 30km from school to a local mountain and back．The school has held hiking 2 since 2001, in order to 3 the students’ bodies and minds, according to Zhao Yong, the headmaster．
The trip 4 about nine and a half hours, and more than 700 Junior 2 students took part in the hike．The trip started at 7：30am and ended at 4：30pm on April 1．
“I felt a strong team spirit during this 5 experience, ” said Li Yaoyu, 14, one of the flag bearers(旗手)of the hike．“When we fell behind others, strong students supported weak ones so that we could 6 the trip．Some of them helped me 7 the flag．I wouldn't have been 8 to finish the trip without their help．”
On the way back to school, Shao Mingyang, an eighth grade student, couldn't go on with the trip because he was a little 9 ．“We suggested that he take the school 10 or give up the trip, but he 11 and insisted(坚持)on walking by himself, ” said Wang Daoyuan, Shao's teacher．
Shao came back to school at 5：05pm．He was the last to finish the hike．His classmates waited for him at the school gate and 12 for him．“I felt 13 for my students, especially Shao Mingyang．I'm happy to see them learn the 14 of perseverance(坚持不懈), which will be very 15 in their future lives, ” said Wang．
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