2. 外语
  3. Rock climbing is an activity in which participants climb up, down or across natural rock formations or artificial rock walls. Th

Rock climbing is an activity in which participants climb up, down or across natural rock formations or artificial rock walls. Th

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问题     Rock climbing is an activity in which participants climb up, down or across natural rock formations or artificial rock walls. The goal is to reach the【B1】______of a formation or the endpoint of a pre-defined route without falling. To【B2】______ complete a climb, one must return to the base of the route safely. Due to the length and extended endurance required, accidents【B3】______ happen on descent than ascent, especially on the larger【B4】______ pitches. Rock climbing competitions have the objectives of either completing the route in the quickest possible time or【B5】______ the farthest point on an increasingly difficult route. Scrambling, another activity involving the scaling of hills and similar formations, is similar to rock climbing. However, rock climbing is generally differentiated by its sustained use of hands to support the climber’s weight【B6】______ to provide balance.
    Rock climbing is a physically and mentally demanding sport, one that often tests a climber’s strength, endurance, agility(敏捷)and balance along with mental control. It can be a dangerous sport and knowledge of proper climbing【B7】______ and usage of specialised climbing equipment is【B8】______ for the safe completion of routes. Because of the wide range and variety of rock formations around the world, rock climbing has【B9】______ several different styles and sub-disciplines. While not an Olympic event, rock climbing is【B10】______ by the International Olympic Committee as a sport.
【B5】
选项
答案attaining
解析 该句使用了either．．．or．．．结构，可判断空格缺少的词与completing并列，为动名词。attain的意思是“达到，获得”，别忘了一ing形式。
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