Read the following SAT test question and then click on a button to select your answer.

In the figure above, which quadrants contain pairs (x , y) that satisfy the condition x /y = 1?

(A) I only
(B) I and II only
(C) I and III only
(D) II and IV only
(E) I, II, III, and IV

来源:可可英语 http://www.kekenet.com/sat/201406/305111.shtml