1892年，英国物理学家瑞利（R．J．S．Rayleigh，1842﹣1919）在测定氮气的密度时，用两种不同的方法制取了氮气，结果却发现两种不同的方法得到的氮气密度不相等．（1）一种方法是通过除去空气中的氧气、二氧化碳和水蒸气余下氮气的方法制得氮气，然后测量它的密度为1.2572克/升．（2）另一种方法是利用氨氧化原理：把氨气通入装有黑色氧化铜固体的玻璃管中进行加热，测得生成的氮气密度为1.2508克/升．开始瑞利认为可能是由于实验操作不当引起了实验误差，但经过多次实验，两种方法得到的氮气密度之间总有一个微小的差异．瑞利没有放过这一微小差异，经过两年精确的实验研究和推理分析，他和英国化学家拉姆塞终于找到造成这一微小差异的答案．

请阅读下面短文，根据其内容，用方框中所给单词的适当形式填空。(每个单词限用一次)

Li Wen is a 16-year-old boy. He works hard and ____  well in school. It is hard to believe that he used to have much ____ in school. His parents moved to the city to look for jobs. ____  they couldn't be at home to 1ook ____ him. From then on. he became less interested in ____to school and missed classes. Then his parents made a ____  to send him to a boarding school. He was shy and had no friends. Life there was difficult for him. One day he told his teacher he wanted to____  the school. His teacher called his parents md advised them to come back and talk with their son in person. Then his parents came back and had a talk with him. This ____changed his life. He realized that his parents would always love him and they would be ____ of everything good that he did. Now he is much____ and more outgoing than he used to be.

如图所示，a、b是地球表面北半球不同纬度上的两个点，如果把地球看作是一个球体，a、b两点随地球做匀速圆周运动，这两个点相同的（  ）

据统计，目前全世界每天有75个物种灭绝，意味着约每小时就有3个物种从地球上永久地消失。生物多样性的破坏将对地球环境造成深远影响，对人类生存和发展的条件造成难以估量的破坏。这启示人们（  ）

①顺应社会发展规律就能实现人与自然和谐相处

②要善于根据物种之间的联系创造出新的生态平衡规律

③建立人为事物的联系，要以尊重自在事物的联系为前提

④尊重规律、接规律办事是正确改造客观世界的关键