单选题 Rock climbing is so popular now that many people are able to______the steepest face with great agility.
【正确答案】 A
【答案解析】解析：本题空格处是说很多人能够攀登最陡峭的岩面。A项“scale攀登，爬越”符合题意。其他三项“surpass超越，胜过；overcome战胜；mount登上”都不正确。