试题详情
将下列单词的编号填入空格，每空格限填一词，每词只能填一次
| A. exam B. Twenty C. climbing D. protect E. climb F. their C. activity |
Chengdu University is teaching students how to a tree using professional equipment(专业设备). students enrolled(报名) in the course. At the end of the training, tee students bare an . It tests climbing skills. Tree climbing is an outdoor . The teachers have taken some steps to the safety of the students and the health of the tree.
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