单项选择题The asocial personality of Americans results from ______.
单项选择题The survey conducted by Ben suggested that people ______ regretted most having not got more education.
单项选择题The phrase mammoth bureaucracy in Line 2, Paragraph 4 refers to ______.
单项选择题Euthanasia is often called mercy killing , which implies that ______.
单项选择题Thanksgiving Day is celebrated in ______.