A. how far the grooves are

　　B. how big the grooves are

　　C. the number of the grooves

　　D. the speed of the car

　　9. The underlined word “optimal” in the passage might mean ________.

　　A. fastest

　　B. possible

　　C. best

　　D. slowest

　　10. In order to hear the music well, you have to ______.

　　A. drive very fast

　　B. drive slowly

　　C. open the windows wide

　　D. keep the windows closed

　　11. What’s the best title of the passage?

　　A.A New Type of Music

　　B. Melody Roads in Japan

　　C.A Musical Road Surface

　　D.A New Invention in Japan

　　D

　　Babies don't learn to talk just from hearing sounds. New research suggests they're lipreaders too.

　　Florida scientists discovered that starting around age 6 months, babies begin shifting from the eye gaze(注视)to studying mouths when people talk to them.

　　“In order to imitate you, the baby has to figure out how to shape their lips to make that particular sound they're hearing，” explains psychologist David Lewkowicz of Florida Atlantic University, who led the study. “It's an incredibly complex process.”

　　Apparently it doesn't take them too long to absorb the movements that match basic sounds. By their first birthdays, babies start shifting back to look you in the eye again ?unless they hear the unfamiliar sounds of a foreign language. Then, they stick with lipreading a bit longer.

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