设定义在R上的奇函数y=f（x），满足对任意t∈R都有$f\left(\frac{1}{2}-t\right)=f\left(\frac{1}{2}+t\right)$，且x∈0，$\frac{1}{2}$时，f（x）=﹣x²，则f（3）+f（﹣$\frac{3}{2}$）的值等于（　　）

吕思勉在《中国通史》“衣食”篇中提出，“以中西的服饰相较，大体上，自以中国的服饰为较适宜。现在的崇尚西装，不过一时的风气罢了。”材料表明作者的观点是（   ）

下表所示“柏林危机”一共有三次，反映出冷战的基本特征是（    ）

爆发时间	原因	结果
1948年6月	苏联阻塞铁路和到柏林西部的通道	1949年5月苏联宣布解除封锁
1958年	苏联发出最后通牒，要求英美法六个月内撤出西柏林驻军	以苏联让步完结
1961年	苏联重新提出西柏林撤军要求	以苏联在东柏林筑起柏林墙作结

百米赛跑中，观众是以____的方法比较运动员运动的快慢；而终点裁判员是以____的方法比较运动员运动的快慢．

根据短文内容，选择最佳答案。    Do you know that in some parts of the world, people build temporary（暂时的）hotels made of snow and blocks（大块）of ice? These are known as ice hotels.
    Unlike usual hotels, all the rooms in the ice hotels are made of ice. In some ice hotels, even the glasses for drinks are made of ice blocks. So they only serve cold drinks. Also, hot food is not served in the ice hotels, but guests can eat hot food at places nearby.
    To keep warm, guests sleep in comfortable sleeping bags on ice blocks that are covered by mattresses（床垫）and reindeer skins（驯鹿皮）.
    There are some places in the ice hotels that are heated, such as the bathrooms. This is because, even though it is not as cold in the ice hotels as it is outdoors（在户外）, indoor temperatures are still very low.
    Perhaps the most interesting thing about the ice hotels is that they are rebuilt every year. They can be used only during the winter months. The ice hotels melt（融化）away when spring arrives. The ice blocks used to build these hotels are from nearby rivers. So, when the ice hotels melt away, they melt back into the rivers.