阅读下述材料，回答问题：                    
欧洲航海者的日记显示，在15世纪以前，毛里求斯岛上的渡渡鸟随处可见。后来欧洲殖民者到达了毛里求斯岛，他们疯狂地捕猎肉味细嫩鲜美的渡渡鸟，加之殖民者带来的猪、狗、鼠等，渡渡鸟灭绝了。渡渡鸟灭绝之后，毛里求斯岛上的卡尔瓦利亚树也面临灭绝的危险。这种树的果皮坚厚，种子很难萌发。渡渡鸟最喜欢吃卡尔瓦利亚树的果实，果实经过渡渡鸟的消化道后，果皮变薄了，果实中的种子得以正常萌发。
（1）渡渡鸟灭绝是一种生物的消失，人类的活动破坏了____ 的多样性。
（2）渡渡鸟消失了，渡渡鸟个体所构成的基因库也随之消失，人类的活动也破坏了____ 的多样性。
（3）渡渡鸟灭绝后，卡尔瓦利亚树不能正常发芽，致使森林生态系统受到破坏，许多生物失去了栖息环境，导致了____ 多样性和____ 多样性的进一步丧失。

根据短文内容完成句子。

   The programmes Sun Xiaomei hosts might be among the shortest on CCTV. On Screen Next Week is on once a week for 15 minutes, and TV You, He and I comes on for five minutes each time once a week too. “Though these programmes are short, I have many ideas to make them more lively for the audience,” she said.

   Sun was interested in music in her childhood. She played the violin since the age of five until she finished middle school. At first her father wanted her to enter a music school; however, 16-year-old Sun Xiaomei became a student in Beijing Broadcasting College.

   Sun loves her job as a hostess very much. She pays great attention to learning from her comrades(同事), especially Zhao Zhongxiang. When Zhao Zhongxiang hosted The World and The Animal World, Sun would sit beside him to learn.

 “I am sure that when I am seen by hundreds of millions of audience on the weekend, I can make friends with them through my warm and easy talk,” she said.

适应时代要求和人民愿望，党的十八大报告把中国特色社会主义事业总布局由“四位一体”拓展为“五位一体”，把生态文明建设放在突出地位，融入经济建设、政治建设、文化建设、社会建设各方面和全过程，努力建设美丽中国，实现中华民族永续发展。上述材料主要表明（  ）

①实践是认识的来源和发展的动力 ②认识具有无限性、上升性和循环性 ③真理是客观的、具体的有条件的 ④追求终极真理是永无止境的过程