Unnecessary shadow In the Physics of smoke

#1

I tried Physics of smoke in blender.
In my Model,There are 5 objects (plane003,cube002(domain),cube004,plane004(flow),lamp).
Rendering results shows to exists shadow of the cube002(domain) at the plane003.
Originally, This shadow isn’t necessary.
How can I ban blender to render the shadow of cube002(domain)？
rendering image
blender screen
data

I’m sorry.
You are unnecessary to response because this thread is same as my thread below.

#2

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