单选题：To give the forest a sense of realness, all the following ar

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题目内容：
To give the forest a sense of realness, all the following are used EXCEPT that __________. A．A　hidden loudspeakers are used to produce forest sound
B．B　a huge videoscreen is put up on the back wall
C．C　special equipment is employed to produce forest smells
D．D　the forest is surrounded by front and back walls
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