、下列叙述正确的是（ ）
A．有一组对边平行，另一组对边相等的四边形是等腰梯形
B．有一组对角互补的梯形是等腰梯形
C．有一组邻角相等的四边形是等腰梯形
D．有两组邻角分别相等的梯形是等腰梯形。
答案：B
因为梯形一组对边平行（AD平行BC）
所以一组临角互补（角A加角B等于180°）
因为对角互补（角A加角C等于180°）
所以角B等于角C
是等腰梯形
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| Kate's father and mother 1 teachers. They teach 2 the same school. They go to school 3 their bikes at seven in the 4 , and they go 5 at five in the afternoon.Kate and 6 brother, Jack are 7 students. They are in the same 8 , but they are in 9 grades. Kate is in Grade One. Jack is in Grade Three. Now it’s four o'clock in the afternoon. It's 10 to play games. | |||
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