问答题
3. While the positive cycle can be difficult to start, once it's started, it's easy to continue. Keeping on doing good deeds brings us peace of mind, which is important for our happiness. (Passage Two)
【正确答案】 然而这种积极的循环比较难开始，一旦开始就很容易坚持。坚持做好事给我们的心境带来安宁，这对我们的快乐十分重要。
【答案解析】 Once曾经；bring sb. sth. 给某人带来某东西；be important for对……很重要。