为了更好的（   ），北极熊的鼻子、耳朵等暴露在外部的器官长得越小。

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。
     Some years ago ,I was at a subway  station in Los Angeles  waiting in line to buy a ticket. As Istood there I saw a young man asking people for money so that he could buy hisbreakfast. Most of the travelers simply ____ (ignore) the young man or gave ____(he) a dirty look, yet a well-dressedmiddle-aged man reacted differently. When ____ (approach) by the young man, the gentlemanlooked ____at him and quietlyasked, “How much will you need?” I couldn’t hear ____the young man said but watched as thegentleman pulled several ____(note)from his wallet and ____ (calm) placed them in the young man’s hands.
         I don’t know whether the young man actually used the money forhis breakfast or for ____purposes.What I do know is that I witnessed two different reactions to the samesituation. I saw people who ____(be) either afraid or annoyed. Andthen I saw the gentleman who was not afraid and treated the homeless young manas though he were a brother. I decided then and there that, even though we haveto be____(care) in this world, Iwould rather be like the gentleman.

依次填入下列各句横线处的词语，最恰当的一组是        (　　)
①步入职场，眼前充满机遇和挑战，但也荆棘密布，对于涉世不深的年轻人，应当注意，“大礼不辞小让”并非很好的________之道，许多日常生活中的细节会影响你的前程。
②调查人员在事故煤矿调查发现，事发之后，矿方转移尸体，________原始记录，销毁有关证据，隐瞒事故不报。
③研究报告认为，目前________发展中国家食品出口的市场壁垒主要有这几种：产品注册、出口文件问题及海关规范，SPS协议、技术壁垒，运输及搬运规范、投资与融资问题，国际贸易规范。
④但就在投机者几乎一致选择持有大量美元空头头寸之时，看涨日元的投资者必须警惕政府进行________的可能性。另外，一些相关技术指标增加了美元短暂向上调整的风险。

学校旗杆的顶端安装有____（选填“定滑轮”或“动滑轮），目的是为了使用方便但不省力；在起重机械中，为了既省力又能改变力的方向，常常需要用____．

时刻在时间坐标轴上对应一点，时间在时间坐标轴上对应于两点间的一段．____（判断对错）