1.bare的第一个意思就是not covered by clothes [= naked]
2.race的意思：to compete against someone or something in a race，所以compete的意思要比race广，math是不是打错了，如果是match的话，if you are matched against someone else in a game or competition, you are competing against them 所以compete=be matched against
3.fear是动词或名字，而affraid是形容词，所以不用进行区分
如果要真正分清很多看似近义的词之间的区别，只有一个办法，用原版的完全英英对照的词典，这样意思和用法上的区别就一目了然了