问题补充：
As we know, every four years athletes from all over the world compete medals in the Olympic Games.
A. against
B. for
C. with
D. as
答案：
A. against
(答案→)B. for
C. with
D. as
解析：考查介词：ABC都可以搭配compete，A. compete against和…竞争B. compete for为了…而竞争，C. compete with和…竞争，句意：我们都知道，每四年来自世界各地的运动员都会在奥运会中为了奖牌而竞争。选B。
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