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一、选择题: 1.如图1,△ABCD,∠B和∠C的平分线交于O点,BD=DO,延长DO交AC于E.若AB=8,AC=6,则△ADE的周长是( ). A.7 B.10 C.14 D.20 2.如图2,△ABC是等边三角形,AD=BE=CF,如果每三个三角形作为一组,图中共有全等三角形( ). A.2组B.3组C.4组D.5组3.某市1995年-2001年国内生产总值年增长率变化情况如图3所示,从图上看,下列结论中正确的个数为
First, multiple-choice questions: 1. As shown in Figure 1, the △ABCD, ∠B, and ∠C bisectors are crossed at point O, BD=DO, and the extended DO is ACed at E. If AB=8, AC=6, △ADE The perimeter is (). A.7 B.10 C.14 D.20 2. As shown in Fig. 2, △ABC is an equilateral triangle and AD=BE=CF. If there are three triangles as a group, the total Congruent triangles (). A.2 Group B.3 Group C.4 Group D.5 Group 3. The change in the GDP growth rate of a city from 1995 to 2001 is shown in Figure 3. The correct number of the following conclusions is