42. Which of the following is the most appropriate topic sentence for the paragraph below?
(A) The Chinese writing system is the only existing system that consists of only picture words.
(B) The Chinese writing system developed from ancient picture writing.
(C) In learning the Chinese writing system, we have to draw pictures for words.
(D) The Chinese writing system is difficult to learn, especially picture writing._______________ At the very beginning, the picture words resembled closely the objectsthey were referring to. Examples are the words eye, mouth, human, mountain, sun, and moon.Over time, the words have changed in form; the picture signs became characters. The Chinesecharacter for moon, for instance, first took the shape of a crescent moon before developing to itspresent form, and the word sun today no longer shows heat radiating from a sun.