帮帮忙啊！！急！！！！口试题目my favourite english word/idiom/proverb

I'm not really very keen on that.这句是我最喜欢的idiom之一(意思是：我不是很喜欢)
如何认识？study from a book or when I chatted with a friend who from an English-speaking coutry on internet.
原因？Because when some friends of mine asked me about my opinion of something, if I really don't like it, I can't just tell them I don't like it or it's so boring, so stupid... But on other side, I must tell them I don't like, so it's a very good sentence to explain how I feel and it won't hurt their feeling, either. Sometimes I also tell them, "It's not my cup of tea."（也是一句idiom，直译是“这不是我的一杯茶”，理解一下就是“这不是我的风格，不是我所喜欢的东西”和之前那句意思相近，不过对国外人而言，之前那句更美一些） I think that sort of idioms are really beautiful. They're really useful and beautiful English.