关于声波和电磁波，下列说法正确的是（　　）

A．声波和电磁波传播速度相同

B．声波不会被反射，电磁波可以被反射

C．声波和电磁波传播都需要介质

D．电磁波和声波都可能产生环境污染

下列事件过程的功能是：建立一个名为Data1的随机文件，存放角度值及这些角度的正弦函数值和余弦函数值，角度为1，2，3，…，90。请在空白处填入适当的内容，将程序补充完整。
Private Type Ang
K As Integer
Sinx As Single
Cosx As Single
EndType
Private Sub Form_Click()
Dim Y As Single
Dim i As Integer
Dim Ksc As Ang
Open ______
Y=3.14159/180
For i=1 To 90
Ksc. K=i
Ksc. Sinx=Sin(i*Y)
Ksc. Cosx=Cos(i+Y)
______
Nexti
Close#2
Elid Stub

A．"..\Data1. txt "For Random As#1 Len=10 Put#1, i, Ksc

B．"..\Data1. txt "For Random As#1 Len=10 Put#1, Y, Ksc

C．"..\Data1. txt "For Random As#1 Put#1, i, Ksc

D．"..\Data1. txt "For Random As#1 Put#1, Y, Ksc