题目

如图，在△ABC中，DE∥BC，DE分别与AB、AC相交于点D、E,若AD=4，DB=2,则AE：EC值为(    )        A.0.5    B.2       C.      D. 答案：B---Do you know why Anna hasn’t come to school today?        ---I’m not sure. She _______ be ill.      A. can     B. should        C. must          D. may