题目内容：
Inthelastparagraph,theauthortellsusthat
A．difficultiesarebutpartofeveryone'slife． B．depressionandunhappinessareunavoidableinlife．
C．everyoneshouldlearntoavoidtryingcircumstances．
D．goodfeelingscancontributeeventualacademicexcellence．
参考答案：
答案解析：