Question 8: As shown in Rt△ABC, ∠ ACB = 90, ∠ BAC = 30, AB=2, D is a moving point on the side of AB (not coincident with points A and B), and CD passes through the vertical ray CA of point D at point E. Let AD=x and CE=y be in the following image.

Analysis: AD = X. Although D does not coincide with points A and B, and 0 < x < 2, as a multiple-choice question, we might as well think in an extreme way: if D infinitely approaches points A and B, the corresponding values of point Y will approach points √3 and infinity respectively. So you should choose B.