单项选择题
A. 人们过去并未充分了解心灵的宁静对健康极为重要。 B. 如果人们能感觉到大脑的平静，那将对健康极为重要。 C. 人们过去对于心灵的宁静对健康的极端重要性并不了解。 D. 大脑的平静对健康极为重要，这一点人们尚未充分意识到。
A. the average number of injuries for each individual B. the amount of exercises for each individual C. the numbers of the injured and all individuals in training D. the numbers of people doing exercises and those stopped exercises for one week
A. all the activities about plagiarism B. the activities of self-plagiarism C. the argument for the impossibility of self-plagiarism D. the argument for the possibility of self-plagiarism