Because Russell was such a memorable and ______ public speaker, many people mistook his ability to talk about a wide range of topics for genuine ______.

多项选择题Rosario ______ on the problem at length, but no amount of extended reflection could provide her with a satisfactory solution.

多项选择题Biodemographer S. Jay Olshansky regards commercial products that promise to stop aging as ______, arguing that while these nostrums might possibly ______ some of aging s superficial manifestations, they cannot touch the process at its core.