单项选择题X 纠错
A.This apple costs 50.5
B.This apple costs 5.5
C."This apple costs" 50.5
D."This apple costs" 5.5
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A.弹出窗口显示3
B.弹出窗口显示undefined
C.a的值为undefined
D.b的值为null
单项选择题
A.var a=new Array(3)
B.a=new Array(1,2,3,"hello")
C.var a=[true,3.14159]
D.Array d=new Array(1,2,3)