Answer and Explanation:
1. He feels surprised and curious. This is because the green knight is a strange, peculiar, intriguing and somewhat frightening figure. In addition, he arrives suddenly and unexpectedly at court, which leaves not only the narrator surprised, but everyone present at the time. The knight does not have a friendly appearance, which leaves the narrator uneasy.
2. To reveal the narrator's impressions, the author uses descriptive language. This language is loaded with adjectives that are capable of showing in detail the state of the narrator in relation to what is happening. However, the use of descriptive language goes beyond and is able to not only describe the narrator's reaction but also establish an image of what is happening to justify the reaction that the narrator is exhibiting.