题目

第三节．完形填空(共20小题；每小题1．5分，满分30分)   阅读下面的短文，掌握其大意，然后从21--40各题所给的四个选项(A、B、C和D)中选出最佳选项。      Greg Mortenson is a mountaineer. In 1993, he   21   but failed to reach K2, one of the most forbidding of the Himalyayan  22  . He staggered(蹒跚) into a tiny village of Korphe in Pakistan, barely alive. The   23   villagers cared for him and fed him back to health. The __24   they showed to a stranger moved Mortenson, and filled him with a' desire to 25   it.      Lo菜青虫喜食油菜叶，而同一菜田中的菠菜却难觅菜青虫踪迹。可见菜青虫这一行为属于A．先天性行为 B．学习行为 C．迁徒行为 D．社群（会）行为