单项选择题
No act of ______ was more pronounced than his refusal of any rewards for his discovery.
单项选择题 The distinctive qualities of African music were not appreciated or even ______ by Westerners until fairly recently.
单项选择题 The first forty years of life give us the text; the next thirty supply the ______.
单项选择题 He is ______ opponent; you must respect and fear him at all times.
