GRE Text Completion: ETS Fundamental-GRE填空ETS基础 - 9RFXX43E0NP0D6Z2X

A human being is quite (i)____________ creature, for the gloss of rationality that covers his or her fears and (ii)____________ is thin and often easily breached. A. a logical B. problems C. a frail D. insecurity E. a valiant F. morality