A．Heavy homework loads.
B．Long hours' work without play.
C．Carrying heavy backpacks.
D．None of the above.

下列程序的作用是求所有小于或等于30的自然数对。该程序不完整，请补充完该程序(程序执行结果见下图)。 注：自然数对是指两个自然数的和与差都是平方数(如8与17)。 Private Sub Command1_Click() Dim n As Long Dim m As Long Dim s As Single Dim d As String For n=1 To 30 For m=1 To【 】 s =n+ m 【 】 If Sqr (s)=Int(Sqr(s))【 】Sqr(D)=Int(Sqr(D))Then Print n：m End lf Next m Next n End Sub 点击查看答案

A．A whale.B．A snail.C．A snake.D．A human.

A.A
B.
B．A
C.
C．A
D.
D．A
E.

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