题目

If you let pressure benefit________upset you，much more can be accomplished than you thought possible. A．more than         B．rather than C．other than            D．less than   答案：B考查短语辨析。rather than意为“而不是”，连接benefit和upset。more than多于，不仅仅；other than除了，不同于；less than少于。  如图，正方形ABCD的两条对角线相交于点O．点E是OC的中点，连接DE，过点A作AF⊥DE于点F，交OD于点G．若正方形的边长为，则DF＝__________．