17.
如图,把矩形ABCD中的AB边向上翻折到AD边上,当点B与点F重合时,折痕与BC边交于点E,连接EF,若四边形EFDC与矩形ABCD恰好相似,若AB=1时,AD的长为( )
0 293961 293969 293975 293979 293985 293987 293991 293997 293999 294005 294011 294015 294017 294021 294027 294029 294035 294039 294041 294045 294047 294051 294053 294055 294056 294057 294059 294060 294061 294063 294065 294069 294071 294075 294077 294081 294087 294089 294095 294099 294101 294105 294111 294117 294119 294125 294129 294131 294137 294141 294147 294155 366461
| A. | $\frac{1+\sqrt{5}}{2}$ | B. | $\frac{\sqrt{5}-1}{2}$ | C. | 3-$\sqrt{5}$ | D. | $\sqrt{5}$-1 |