Not that we don’t have other powers of communication. Our facial expressions convey our emotions, such as anger, or joy, or disappointment. The way we hold our heads can indicate to others whether we are happy or sad. This is so-called “body language”. Bristling (直立的) fur is an unmistakable warning of attack among many animals. Similarly, the bowed head or drooping tail shows a readiness to take second place in any animal gathering.

　　Such a means of communication is a basic mechanism that animals, including human beings, instinctively acquire and display. Is the ability to speak just another sort of instinct? If so, how did human beings acquire this amazing skills ? Biologist can readily indicate that particular area of our brain where speech mechanisms function, but this doesn’t tell us how that part of our bodies originated in our biological history.

　　72. According to the passage, the wonder we take for granted is________ .

　　A. our ability to use language

　　B. the miracle of technology

　　C. the amazing power of nature

　　D. our ability to make noises with mouth

　　73. What feature of “body language” mentioned in the passage is common to both human and animals?

　　A. Lifting heads when sad.

　　B. Keeping long faces when angry.

　　C. Bristling hair when ready to attack.

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