A.36

B.48

C.56

D.64

A.48                                                 B.56

C.64                                                 D.72

直线y=x-3与抛物线y²=4x交于A、B两点，过A、B两点向抛物线的准线作垂线，垂足分别为P、Q，则梯形APQB的面积为

1. A.
   48
2. B.
   56
3. C.
   64
4. D.
   72