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单项选择题
A.background:url(a1.jpg)repeat-x;
B.background-color:repeat-x;
C.background:url(a1.jpg)repeat-y;
D.background:repeat;
单项选择题
A.background:none
B.background-color:red
C.background-repeat:no-repeat
D.background-image:green
单项选择题
A.background-attachment
B.Background-color
C.background-image
D.background-width