[解析]
(1)细节理解题。根据第一段It's held on 29 July.Governments and citizens across the world organize awareness programs on that day to spread the importance of protecting tigers.(世界各地的政府和公民在这一天组织宣传活动,以传播保护老虎的重要性)可知,在国际老虎日世界各地都为它举办了一些活动。故选D。
(2)细节理解题。根据第二段People's fascination for tigers is obvious from the fact that tigers are still a part of many national symbols and flags.(老虎至今仍是许多国家的象征和国旗的一部分,可见人们对老虎的迷恋)可知,老虎可以用来表现一个民族的精神。故选D。
(3)细节理解题。根据第二段Unfortunately,the population of tigers is fast decreasing.Every part of tigers from tail to skin to nail is traded in the illegal market for very high values.Many tigers are hunted,which is one of the key threats to their existence.(不幸的是,老虎的数量正在迅速减少。老虎的每一个部位,从尾巴到皮肤再到指甲,都在非法市场上以极高的价值进行交易。许多老虎被猎杀,这是它们生存的主要威胁之一。)可知,老虎的数量正在迅速减少,这主要是因为它们在非法市场上被猎杀。故选A。
(4)细节理解题。根据最后一段Even though this is just a small increase,it's a huge symbolic victory in our efforts against the destruction of forests and wildlife.It's very important that we all join together in this effort,not only to save tigers,but also to save our forests.(尽管这只是一个很小的增长,但这是我们反对破坏森林和野生动物的努力的一个巨大的象征性胜利。非常重要的是,我们所有人都要共同努力,不仅要拯救老虎,还要拯救我们的森林)可知我们应该花更多的精力来保护老虎。故选C。