answer
单词辨析：
普通用词，指通过文字、言语或行动作出回答，一般不后接介词 to。
He cannot answer your question.
他没法回答你的问题。
I asked her a question, but she would not answer.
我问了她一个问题，但她不愿回答。
You should answer the questions in the first part in ten minutes.
你应用10分钟解答第一部分的题。
比较正式，多指经过考虑后给出答案，一般不用于口语，常后接介词 to。
She didn't reply to his message.
她没有回复他的留言。
He didn't know how to reply to her letter just then.
那时，他不知道如何给她回信。
较正式用词，指以言语或行动作出回应，常后接介词 to/with。
He didn't respond to any of her questions.
他没有回答她任何问题。
His friends responded with offers of help.
对此他的朋友们伸出援手。
主要指习题、难题等的答案。
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。
指试题、竞赛题等的答案，也可指某一问题的解决办法。
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。
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。
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。
相关例句：
He would never take no for an answer.
他从来都坚持己见。
We provide specially designed shopping trolleys to answer the needs of parents with young children.
我们提供特别设计的购物车，以满足带幼儿的父母的需要。
Without waiting for an answer, he turned and went in through the door
未等答复，他就转身进了门。
In answer to speculation that she wouldn't finish the race, she boldly declared her intention of winning it.
为了回应她会中途退赛的猜测，她大胆地宣布她要赢得这场比赛。
To obtain her degree, she answered 81 questions over 10 papers.
为获得学位，她回答了10页纸上的81个问题。
She answered an advert for a job as a cook.
她看到一则招聘厨师的广告后写信应征。