As a general rule, all forms of activity lead to boredom when they aare performed on a routine(常规)basis. As a matter of fact, we can see this 41 at work in people of all 42 . For example, on Christmas morning, children are excited about 43 with their new toys. But their 44 soon wears off and by January those 45 toys can be found put away in the basement. zxxkThe world is full of 46 stamp albums and unfinished models, each standing as a monument to someone’s 47 interest. When parents bring home a pet, their child 48 bathes it and brushes its fur. Within a short time, however, the 49 of caring for the animal is handed over to the parents. Adolescents enter high school with great 50 but are soon looking forward to 51 . The same is true of the young s going to college. And then, how many 52 , who now complain (抱怨) about the long drives to work, 53 drove for hours at a time when they first 54 their driver’s license (执照) Before people retire, they usually 55 to do a lot of 56 things, which they never had 57 to do while working. But 58 after retirement , the golfing, the fishing, the reading and all of the other pastimes become as boring as the jobs they 59 . And , like the child in January, they go searching for new 60 .

A．promise
B．burden
C．right
D．