Every day we experience one of the wonders of the world around us without even realizing it． It is not the amazing complexity of television， nor the impressive technology of transport． The universal wonder we share and experience is our ability to make noise without mouths， and so transmit ideas and thoughts to each other's minds．①This ability comes so naturally that we tend to forget what a miracle it is．
②Obviously， the ability to talk is something that marks humans off from animals． Of course， some animals have powers just as amazing． Birds can fly thousands of miles by observing positions of the stars in the sky in relation to the time of day and year． In Nature's talent show， humans are a species of animals that have developed their own special act． If we reduce it to basic terms， it's an ability for communicating information to others， by varying sounds we make as we breathe out．
③Not 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（本能地）acquire and display．④If so， how did human beings acquire this amazing skills？ Biologists 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．



According to the passage， the wonder we take for granted is ______ ．

A. the amazing power of technology
B. our ability to use language
C. the unforgettable miracle of nature
D. our ability to make noises with mouth

Which is the most suitable place for "Is the ability to speak just another sort of instinct？" ______

A. ④
B. ③
C. ②
D. ①

This passage is mainly about ______ ．

A. the development of body language
B. the special role humans play in nature
C. the power to convey information to others
D. the difference between humans and animals