[单项选择]Many writers complain that their biggest difficulty is finding a subject. Sometimes that difficulty appears less complicated because the subject is identified in a writing assignment. But writing assignments vary in how they are worded, what they assume, and what they expect. For example, you may be asked to discuss two characters in a play you have read. This open assignment does not identify a subject; it merely identifies an area in which a subject needs to be developed. Another version of that same assignment might ask you to compare and contrast the way the two characters make compromises. This closed assignment identifies a subject, but it assumes you how to work with a specific form (comparison and contrast essay) and it expects you to produce specific information. In other words, although the second assignment restricts the subject, you must still select and arrange the subject matter of your essay.
When you have a free choice of subject ,your difficulties may appear mor
A. One should choose a subject he knows quite well.
B. One should write about something readers don’t know.
C. One should limit his writing to a specific subject.
D. One should choose an interesting subject.