Answer:
Katniss reveals Peeta has a chance in hand-to-hand combat for he is strong physically while Peeta mentioned that Katniss is good with her bow and arrow.
Katniss is so surprised because she did not expect him to know so much about her.
Step-by-step explanation:
Suzanne Collins' The Hunger Games tells the story of a dystopian world where the residents are entertained with the annual games. This science fictional story shows the story of Katniss Everdeen from District 12 overcome the odds and win the games, also bringing down the authoritarian power of the rich.
Peeta tells Haymitch that Katniss is good in hunting, in her use of the bow and arrow while Katniss says that Peeta is strong. She reveals how he is able to lift heavy bags and thus he'll be good in hand-to-hand combat.
The revelation by Peeta about her skills surprised Katniss. She at first thought that Peeta was just going along the "twin act" of supporting each other. But at times, she also wondered how he was able to know so much about her. Even though she suspects him of trying to demean her, she also wonders how he knew so much about her.