下列选项中，不属于动物个体间信息交流的是

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。

    The truth ____ trees are vital to our life is not a secret. They provide us withfood, wood and most ____(important), oxygen. Now there is one more thing we canadd to this list—blocking out harmful bacteria from water.

    The discovery ____(make) by a team____(consist) of scientists from the Massachusetts Institute of Technology(MIT) and high school students ____ were seeking a natural water filter—onethat would help communities in developing countries that do not have ____(accessible)to modern water filter systems.

    The ____(research), led by Professor RohitKarnik, decided to turn to trees for help because they could allow liquid toflow through, while blocking out air bubbles.

    They began by cutting 1.5­inch­wide sectionsof tree bark from the branches of a white pine tree. The people related thentested the wood's filtering ability by pouring water containing red dyeparticles of different sizes through. ____ their amazement, they found that itwas effective in trapping all the particles. ____(encourage), the teamconducted ____ experiment, this time with water that contained bacteria. Sureenough, the sapwood held back 99% of the bacteria, allowing only 1% to flowthrough.

设l，m，n表示三条直线，α，β，γ表示三个平面，给出下列四个命题：
①若l⊥α，m⊥α，则l∥m；
②若m⊂ β，n是l在β内的射影，m⊥l，则m⊥n；
③若m⊂α，m∥n，则n∥α；
④若α⊥γ，β⊥γ，则α∥β.
其中真命题为

中国社科院研究员茅于轼先生在北大讲学时说：“不能借口少数服从多数而剥夺少数

人的基本权利，因为少数人的基本权利若得不到保障，最终可能连***的基本权利也

得不到保障。”“文革”中，基本权利被肆意践踏，被迫害致死的***是（   ）

依次填入下面这段文字中横线上的一项是（      ）

作为一个敏感、单纯、热情而富于诗人气质的小说家，巴金以创作作为自己生活的有机部分，____加上他又总是常常带着感情去讴歌青春，所以首先为广大青年读者所欢迎，成为青年所依赖的朋友。