According to the text, Jack Andraka: 1? thinks the Internet played a very important role in his research. 2? said he had used online search engine Google to study about cancer. 3? is quite positive that his method can detect nearly all kinds of cancer. 4? said the information he had found on pancreatic cancer was very basic. 5? says that 50 pc is not a very good survival rate for pancreatic cancer. Which of the items above are true, according to the text?