"A drop of water is still thinking of its source; a grain of rice is rewarded with a spring of water". 2013 mainstream media launched a series of public service announcements (PSAs), combining traditi

Test Question Analysis: In 2013, the mainstream media launched a series of public service announcements (PSAs), which injected Chinese elements such as traditional ballads, paper-cutting from the county of Weixian, and Yangliuqing New Year's Paintings into the PSAs, which embodied a combination of the spirit of the times and national culture. Therefore, ① is correct; these PSAs have played a positive role, so ③ is correct; ② has nothing to do with the meaning of the question, so it is excluded. The question limb ④ statement is wrong, because the inexhaustible source of cultural innovation is practice, so the answer is chosen A.