题目

皮划艇运动员用力划水时，上臂肌肉的状态是（   ）   A.肱二头肌收缩、肱三头肌收缩            B肱二头肌舒张、肱三头肌收缩       C.肱二头肌收缩、肱三头肌舒张            D.肱二头肌舒张、肱三头肌舒张 答案：CRead and fill in the blanks．(读一读，填一填)Jack can play the flute．And I ________ play the piano．