单项选择题
A. Her diet is not effective. B. She has lost much weight. C. Her favorite food is banana. D. She has neither gained nor lost weight.
A. encourage others to be happier B. move their misfortune to others C. weaken the impact of misfortune D. help unlucky people deal with misfortune
A. classified knowledge B. the study of unrelated fields C. the study of unrelated subjects D. an attempt to explain natural phenomena