第一小组：运用比较的方法研究战争。下表是该组同学研究成果的一部分。

20世纪主要战争比较表

第二小组：运用图片资料研究战争。下列是他们收集的部分图片。

第三小组：用史论结合的方法研究战争。

第四小组：以史为鉴，关注时政。他们收集到一幅反映日本对二战态度的漫画。漫画名为《我先把这字模糊了!》它讽刺了当前日本右翼势力参拜靖国神社及日本首相安倍晋三宣扬“侵略”性质尚未定论的行为。

1kW•h的电能可供40W的灯泡正常发光的时间是（　　）

   Do you have the ability to live cheaply? Now here's a true story of an American girl，Sarah．1Sarah left university，she began to live in New York City on her own．She 2 a job in a publishing house，but the salary(薪水)was 3 $30，000 a year．Her parents thought her life would be hard，but Sarah 4live on her salary and still saved $5，000 in a year．How was that 5 in one of the most expensive cities in the world?
   Cheap living 6starts with keeping the big cost small．For most people，that 7housing．So Sarah chose to share a flat with three other friends．Her next biggest cost was  8．When she ate out，she went to cheap restaurants．9 she bought a $9．99 whole chicken at a local restaurant．She then10the chicken bones(骨头)home and made soup out of them．Nowadays young people often 11 a lot of money on entertainment(娱乐)．But Sarah said，"I enjoy walking 12 in New York City．I love going to museums and parks．" Did Sarah feel poor13 cheap living? Not really．She even managed to take two trips，one to the Netherlands，14to Portland．
   “Don't think of saving money as something15．It's a kind of game，"said Sarah．