选择题 A human being is quite _____ creature, for the gloss of rationality that covers his or her fears and _____ is thin and often easily breached.

【正确答案】 A

【答案解析】句意：人类是一种极其脆弱的生物，因为掩盖着其恐惧与不安全感的那层理性的外表是那么薄弱，且常常易于破裂。 frail脆弱的。 insecurity不安全。 ludicrous滑稽的。 valiant英勇的。phobia恐惧；憎恶。 morality道德；品行。