单项选择题
A．the passing of information and making of decisions B．the meeting and hitting back of the ball C．the coordinated movements of our eyes, brain and muscles D．a lot of practice before playing tennis
A．use, first, our eyes, then the brain and finally the muscles B．make our eyes, brain and muscles work almost at the same time C．use mainly the arms and legs to hit D．use mainly the muscles so that the ball is met and hit back
A．Spiders were the first life that could live on the island. B．The island is far away from any piece of land. C．Insects could not live on the island without plants. D．Plants were brought to the island by human beings.