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amin= a(1):amax=a(1)
i=2:j=9
Do While i <= j
If a(i) > a(j) Then
(1)
(2)
Else
(3)
(4)
End If
i=1:j=j-1
Loop
Text 1. Text= Str(amin)+"," Str(amax)
上述程序段中方框处可选语句为：
①If a(j)>amax Then amax =a(j)
②If a(j)< amin Then amin =a(j)
③If a(i)<amin Then amin =a(i)
④If a(i)>amax Then amax =a(i)
则（1）（2）（3）（4）处语句依次可为（ ）。
| A．④③②① | B．④②③① | C．③②④① | D．③①④② |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
