阅读下面短文，根据短文内容，回答下列问题。
①Getting recognition（认可）from National Geographic, a famous US magazine, is the dream for many  photographers. A Chinese teenage photographer has made this dream come true.
②With his work Weed（野草）on the Wall, Gong Zijie, a 14-year-old boy from Changsha, Hunan, won the 2014 International Photography Competition for Kids in China. It was hosted by National Geographic Kids. Gong got the first place for the subject Wild Vacation. His photo shows the shadow of a weed on the Forbidden City’s red walls. In photographer Li Shaobai’s words, “The picture is silent but powerful.”
③Gong learned photography from his father, a professional photographer working for Hunan TV. Since the age of 4, he has been following his father to take pictures of nature and society.
④Gong is a patient photographer. When he finds something amazing, he can spend hours waiting for the perfect time to catch the moment. In his first work, Gong took the beautiful view of the sunset near his hometown. It looked simple, but Gong worked for four days to take the best photo.
⑤Now, the young photographer cares more about social （社会的）problems. In Gong’s pictures of Liuyang River, hundreds of dead fish show us the deadly results of pollution. He has made up his mind to document polluted rivers at least once every year to make people pay more attention to environmental protection.
⑥ “Now photography is not only a hobby, but also a duty（责任）for me.” said Gong.

What’s the name of the photo that helped Gong Zijie get the first place?
What does photographer Li Shaobai think of Gong’s work?
Did Gong learn photography by himself?
What does the writer want to tell us about Gong in Paragraph 4?
What can you learn from Gong?