If the artificial is not better than the natural, to what end are all the arts of life? To dig, to plow, to build, to wear clothes—all are direct violations of the injunction to follow nature. 18.If the author’s argument were challenged on the grounds that the construction of buildings has adverse effects on the natural environment, which of the following replies might the author use to respond to the challenge logically? (A) There are human activities, such as making music, that are environmentally harmless. (B) Harming the environment is not an end, or purpose, of the arts of life. (C) The construction could involve the use of natural, not artificial, materials. (D) Constructing buildings is not an “art of life.” (E) Even if the natural environment is disturbed by the construction of buildings, it is improved for human use. 答案是E，不能理解。能解释一下其中的思路吗？？E选项中的it指代什么？？ 谢谢NN

---------------------------------------------- 转朱阁，低绮户，照无眠。 不应有恨，何事长向别时圆？ 人有悲欢离合，月有阴晴圆缺，此事古难全。 但愿人长久，千里共婵娟