D
[解析] 本填空考查上下文的逻辑关系。分析并判定本填空前后文已知信息的逻辑关系:
Traditional Chinese, among many other Asians, respect their elders and feel a deep sense of duty ______ them. Children repay their parents' ______ by being successful and supporting them in old age. This is accepted as a ______ part of life in China.
______, taking care of the aged parents is often viewed as a tremendous ______ in the United States, where aging and family support are not ______ highly. ______, in the youth-oriented United States, growing old is seen as a bad thing, and many old people do not receive respect.
按照上述对比分析,很明显,本填空前后是典型的转折、对立关系,因此答案为D项In contrast(相反地)。