单项选择题 CIRCUMSPECT: PRUDENCE ::（）

单项选择题 Politicians and pollsters alike warn that the outcome of a presidential race remains （）until Election Day itself, and many races depend on factors that run from bad weather （） voter turnout to last-minute scandals.

单项选择题 Thus, global-warming skeptics write off the （） of climate research investigators, emphasizing the （） of others' reasoning, but not of their own.