According to the passage, what would happen to us without communication? Which of the following statements is true?

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问题 According to the passage, what would happen to us without communication?
Which of the following statements is true?

选项 A、Humans do not have adequate knowledge about animal languages.
B、We are now very much aware of animal languages.
C、Most of animals use their facial expressions.
D、All the animals make sounds to communicate with each other.

答案A

解析
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