选择题
2018 AMC 8 Problem 20: Parallel Lines Area Ratio
In triangle ABC, a point E is on AB with AE=1 and EB=2. Point D is on AC so that DE is parallel to BC, and point F is on BC so that EF is parallel to AC. What is the ratio of the area of CDEF to the area of triangle ABC?
2018 AMC 8 第 20 题：平行线面积比
在三角形ABC中，点E在AB上，AE=1，EB=2。 D 点位于 AC 上，因此 DE 平行于 BC，点 F 位于 BC 上，因此 EF 平行于 AC。 CDEF的面积与三角形ABC的面积之比是多少
A.
4/9
B.
1/2
C.
5/9
D.
3/5
E.
2/3