I was impressed by a sentence. "Life is so short, it's all uncertain." _______ whenever I want to encourage someone to make a quick decision, I use this line.
A. therefore
B. so
本题是要读者区分therefore和so；本题选A较好，因为therefore是较so“更合理的推测”，是“因此”的意思。so是用于口语及一般文体，推论一般不严格，如：He told me to do it and so I did it.而therefore就比较正式，推论比较严密，本题就是这样了，因为睡得晚，因此迟到了，两者之间是有比较严密的关系的，所以要用therefore...
