Which of the following is true about birdsongs? The expression "directed communication" in the last paragraph means communicati

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问题 Which of the following is true about birdsongs?
The expression "directed communication" in the last paragraph means communication in which______.

选项 A、the message sender has a specific audience.
B、the communicator sends messages to himself.
C、two communicators send messages to each other.
D、mothers talk to their babies in their mother tongue.

答案A

解析 本文最后一段的第一句给出了"direct communication"的解释:…when the communicator,or sender,focuses the message for a specific audience".其余选项显然与本文不符,而余下的选项是为了更好说明"direct communication"所做的类比。
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