问题
选择题
正方形、菱形、矩形都具有的性质是（ ）
A．对角线相等
B．对角线互相平分
C．对角线互相垂直
D．对角线平分一组对角
答案
∵正方形的对角线互相平分，互相垂直，相等且平分一组对角，
菱形的对角线互相平分，互相垂直且平分一组对角，
矩形的对角线互相平分且相等，
∴正方形、菱形、矩形都具有的性质是：对角线互相平分．
故选B．
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正方形、菱形、矩形都具有的性质是（ ）
A．对角线相等
B．对角线互相平分
C．对角线互相垂直
D．对角线平分一组对角
∵正方形的对角线互相平分，互相垂直，相等且平分一组对角，
菱形的对角线互相平分，互相垂直且平分一组对角，
矩形的对角线互相平分且相等，
∴正方形、菱形、矩形都具有的性质是：对角线互相平分．
故选B．
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| Dear Bob, My name is Rich .I’m fourteen years old .I’m(1)_______ in a middle school .My school is nice and clean. There are 30 students in my class .It’s(2) _______ today . My classmates and I are(3) _______ a good time on the beach .It’s a nice place .The water is blue and clear . Many birds are (4) _______ over the sea .Many people are (5)_______.Some boys are(6) _______ football.Some people are (7) _______ on the beach . A girl is(8) _______ pictures on a chair .Another girl is (9)_______ photos . I’m (10) ________to you ! What are you doing ? I hope you can write to me soon . Best wishes! Rich 1______ 2______ 3______ 4______ 5______ 6______ 7______ 8______ 9______ 10______ |