题目

Directions: For each blank in the following passage there are fourwords or phrases marked A, B, C and D. Fill in each blank with the word orphrase that best fits the context.Nature Therapy We need the tonic ofwildness... At the same time that we are earnest to explore and learn allthings, we require that all things be mysterious and unexplorable, that landand sea be indefinitely wild, unsurveyed and unfathomed by us becauseunfathomable. We can never have enough of nature.—Thoreau One major differencebetween our current lifestyle and those of our evolutionary past is anincreasing 1 from natur小明新买一瓶净量45立方厘米的牙膏，牙膏的圆形出口的直径是6毫米．他早晚各刷一次牙，每次挤出的牙膏长约20毫米．这瓶牙膏估计能用 天． （取3作为圆周率的近似值）