A、A story tells that two friends were walking through the desert( 沙漠). During the trip they had a 41 , and one friend hit the other in the face. The one who was beaten was hurt, but without saying 42 , he wrote in the sand: “ Today my best friend hit me in the face.”
B、They 43 on walking until they found a lake, where they decided to take a bath（洗澡）. The one, who had been beaten, fell into the lake and started drowning(溺水), but the friend saved him. After he came back to life from the near drowning, he wrote on a 44 : “ Today my best friend saved my life.”
C、The friend who had hit and 45 his best friend asked: “ 46 I hurt you, you wrote in the sand and now, you wrote on a stone, why?” The other friend 47 : “ When someone hurts us, we should write it down in sand 48 wind can blow it away. 49 , when someone does something good for us, we must write it down in stone where no 50 can ever blow it away.”
D、( ) 41. A. talk B. joke C. fight picnic