张岱年在《中国文化概论》说：“18世纪伏尔泰等人则拿出了……资产阶级国家蓝图。” 伏尔泰等启蒙思想家设计的国家政体是（    ）

①封建君主专制         ②君主立宪制          ③民主共和制

“苍润高逸，秀出东南”的庐山，是一座千古文化名山。东晋画家顾恺之创作《庐山图》，以艺术形式形象地展现了庐山的自然美。这表明                                     

下列各式中不能用平方差公式计算的是（    ）

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

    Keeping a diary in English is one of the best ways to improve our English writing ability.

    Compared with other forms of writing, it is shorter and takes ____(little) time. It can help us to develop the habit of thinking in English.____we stick to this practice,____ (gradual) we'll learn how to express (表达) ourselves in English. In keeping a diary in English, we certainly run up against many ____ (difficult). In the first place, it often ____(happen) that we have trouble ____(find) proper words and phrases to give expression to our mind. And____ is very hard for us to put them into English properly.

    As far as I am____(concern), my suggestion is that we should always have a notebook and a Chinese­English dictionary within easy reach. We can also turn to our English teacher for help, if necessary. In short, I believe that it is ____great use to keep a diary in English for the development of ____ (we) writing skills.

摄氏温度的规定：在一个标准大气压下，纯净的冰水混合物的温度定为0℃，水沸腾时的温度定为100℃。将0～100℃之间划分为100等分，每一等分就是1℃。华氏温度的规定：在一个标准大气压下，纯净的冰水混合物的温度定为32℉（℉，读作华氏度），水沸腾时的温度定为212℉。将32～212℉之间划分为180等分，每一等分就是l℉。则华氏度F与摄氏度t之间的关系是F=____℉。人的正常体温大约为____℃。