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key n.答案，题解。
〔辨析〕主要指习题、难题等的答案。
〔例证〕Check your answers in the key at the back of the book.
用书后的解答核对答案。
I don't know the key to the puzzle.
我不知道这个谜语的谜底。
answer n.答案。
〔辨析〕指试题、竞赛题等的答案，也可指某一问题的解决办法。
（例证〕the answer to rising crime
解决犯罪率上升问题的办法
What is the answer to question 5？
第五题的答案是什么？
Having all the figures she figured out the answer quickly: it was 249.
有了所有这些数字，她很快就解答出来了，答案是249。
solution n.解决方法。
〔辨析）指解决问题、难题的办法，也可指练习题、竞赛题等的答案，常可与answer换用。
（例证）It seems to me the best solution／answer.
依我看这似乎是最好的解决办法。
It's difficult to find a solution/an answer to the problem.
很难找到解决该问题的办法。
The solutions/answers to the problems are on page 258.
题目的答案在258页上。
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