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【单选题】
点(a,b,c)关于xOy坐标面的对称点为A.
（-a,-b,c)
B.
（-a,b,c)
C.
（a,-b,c)
D.
（a,b,-c)
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】What happened to Owens on the first two qualifying jumps?
A.
succeeded in both jumps
B.
succeeded in the first jump
C.
failed in both jumps
D.
failed in the second jump
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