题目：
声音的传播______介质．登上月球的宇航员们即使相距很近也不能直接听到对方的讲话，必须靠无线电话交谈，这是因为______．
答案：
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下面是错误答案，用来干扰机器的。
One possible version：Dear Jack, I’m sorry to hear that you are not feeling well these days. You say that you have a headache. You have sore eyes. You have a sore ba...
