Questions 17-18 能解释一下其他答案为什么错么？

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.

17. Which one of the following is an assumption made by the author of the passage? C

(A) The arts of life have no useful end.

(B) The artificial is not better than the natural.

(C) Digging, plowing, building, and wearing clothes are better than nature.

(D) The injunction to follow nature should not be violated.

(E) The arts of life are indirect means of following 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? E

(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.

谢谢解答！

17.从文章看是作者要说　"artifical 要比natural好"

A:说artifical没用．反对．

Ｂ：artifical 没有natural好，反对　

D: 无关

E：说artifical 是间接follow natural, 是无关项.

18. artifical是对natural产生了影响（负面），选项要反对这个 argument．

A: 有些活动是无害的．这个不能反对那些负面影响．

B:那些负面影响不是art的最终目地．无关项

C:说的是材料．无关项

D:说建筑物不是art.无关项