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.

若直线 l₁和l₂ 是异面直线，l₁在平面 α内，l₂在平面β内，l是平面α与平面β的交线，则下列命题正确的是（   ）

下列反应的离子方程式书写正确的是（   ）

下面是某校三（一）班各学生参加户外活动“收集矿泉水瓶”个数，请按要求分段整理数据，并回答问题。

52	45	48	32	33	29	41	48
45	46	44	24	38	39	37	44
41	45	49	53	33	36	43	46

某校三（一）班学生参加户外活动“收集矿泉水瓶”个数统计图

收集个数/个	21~30	31~40	41~50	51~60
人数/人	2	7	13	2

请以“记忆中的温暖”为题，写一篇文章。

       作文要求：①选择你最擅长的文体，结合你最熟悉的生活，抒发你最真挚的情感；②认真书写，力求工整、美观；③不少于500字。