题目

 — Are Jiangsu and Zhejiang famous for silk?    — I think so. _______ I know, more than half of the silk in China is produced in Jiangsu and Zhejiang.      A. As long as      B. As far as  C. As many as       D. As little as 答案：B如图，在等边三角形ABC中，点D，E分别在边BC，AC上，且DE∥AB，过点E作EF⊥DE，交BC的延长线于点F． （1）求∠F的度数；（2）若CD=2，求DF的长．