[单项选择]There are two types of people in the world. Although they have equal degrees of health and wealth and other comforts of life, one becomes happy, the other becomes miserable. This arises from the different ways in which they consider things, persons, and events, and the resulting effects upon their minds. The people who are to be happy fix their attention on the conveniences of things: the pleasant pars of conversation, the well-prepared dishes, the goodness of the wines, and the fine weather. They enjoy all the cheerful things. Those who are to be unhappy think and speak only of the contrary things. Therefore, they are continually discontented. By their remarks, they sour the pleasures of society, offend many people, and make themselves disagreeable everywhere. If this turn of mind were founded in nature, such unhappy persons would be the more to be critical. The tendency to criticize and be disgusted is perhaps taken up originally by imitation. It grows into a habit, unknown to i
A. always act differently from others
B. usually have a fault-finding habit
C. can discover the unpleasant part of certain things
D. usually are influenced by the results of certain things