题目

Life is not easy． But it is a great truth because once we truly understand and accept it．Then life is no longer difficult． Most do not fully see this truth．Instead they complain about their problems and difficulties as if life should be easy．It seems to them that difficulties represent(代表)a special kind of suffering especially forced upon them or else upon their families．their class．or even their nation． What makes life difficult is that the process of facing and solving problems is a painful one．Problems , depending on their nature, cause us sadness，or loneliness or reHow many ______?A. ball B. balls