如图所示图象中属于交流电的有（   ）

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

     I had a wonderful time with my exchangeprogram(交流活动中心) in France. It's much 1 than I thought. I felt a little nervous before I reached France, but there wasn't any reason to be so. My host 2 is really nice.

     They managed various ways to make me 3 at home. Every day I 4 practicing 5 French, I wouldn't believe how 6 progress I 7 in French! Although I still make some mistakes, I can think something in French without

    8  everything into Chinese like I used to. My biggest challenge is learning how to behave at dinner table. All the things are really different 9 the way they are at home. You are not supposed to eat anything with your hands except bread. Another thing is that 10 is very rude to say “I'm full now.” you should say “It is delicious." instead.

阅读图文材料，回答问题。

材料一：2017世界田径锦标赛将在英国伦敦揭开战幕，田径世锦赛将于2017年8月4日至13日(伦敦时间)在伊丽莎白女王奥林匹克公园内上演。

材料二：欧洲西部地区略图及气温曲线和降水柱状图。

阅读下列材料，回答问题
材料一  61岁的关天培决意为国牺牲，与家人做了诀别，把多年积蓄的财产分赠给将士鼓励他们英勇杀敌……他带领将士与英军展开了肉搏，最终壮烈殉国。
材料二  “若新疆不固，则蒙部不安，匪特陕、甘、山西各边时虞侵秩，防不胜防，即直北关山，亦将无晏眠之日。而况今之与昔，事势攸殊。俄人拓境日广，则西向东万余里，与我北境相连，仅中段有蒙部为之遮阂。徙薪宜远，曲突宜先，尤不可不预为绸缪者也”。所以“时事之宜筹，漠谋之宜定者，东则海防，西则塞防，二者并重”。
材料三 随从递给他救生圈，他坚决不接，决心与战舰共存亡。他的爱犬飞速游来，衔住他的衣服，使他无法下沉……（他）狠了狠心，用手将爱犬按入水中。
材料四 如图