单项选择题
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．is likely to go down B．is sure to go up C．is likely to go up D．is sure to go down
A．have never discussed who is the world’s greatest poet and greatest dramatist B．never discuss the world’s greatest poets and dramatists C．are sure who is the world’s greatest poet and greatest dramatist D．do not care who is the world’s greatest poet and greatest dramatist