已知定义在R上的可导函数y=f（x）的导函数为f′（x），满足f′（x）＜f（x）且y=f（x+1）为偶函数，f（2）=1，则不等式f（x）＜e^x的解集为____ 

①鼻毛  ②声带   ③气管的内表面覆盖着有纤毛的黏膜  ④鼻黏膜  ⑤会厌软骨

郑萌用已知线段a，b（a＞b，且$\sqrt{2}$b≠a），根据下列步骤作△ABC，则郑萌所作的三角形是（　　）

步骤：

①作线段AB=a；

②作线段AB的垂直平分线MN，交AB于点O；

③以点B为圆心，线段b的长为半径画弧，交⊙O于点C，连接BC，AC．

Dear Frank,

    In your last letter, you asked me about meals in English homes. Now let me tell you something about it.

    In many English homes, people eat four meals a day: breakfast, lunch, afternoon tea and dinner.

    People have breakfast at any time from seven to nine in the morning. They eat vegetables, eggs and bread. English people drink tea or coffee at breakfast.

    Lunch comes at one o'clock. Afternoon tea is from four to five in the afternoon, and dinner is at about half past seven. First, they have soup, then they have meat or fish with vegetables. After that, they eat some fruits like bananas, apples or oranges. But not all English people like those fruits. Some of them have their dinner in the middle of the day. Their meals are breakfast, dinner and afternoon tea. All these meals are very simple.

    I hope you can visit England someday.

Yours,

Eric

列宁曾说：“现代文明的美国历史，是由一次伟大的，真正解放的、真正革命的战争开始的。”这里所说的“战争”是指（    ）