题目

This is ________ book I borrowed yesterday. Isn't it ________ interesting one? A . the; the B . the; a C . a; the D . the; an 答案：D当你做任何一个动作时，都会包括以下步骤：① 骨骼肌收缩 ② 骨骼肌接受神经传来的刺激 ③ 骨绕关节转动 ④ 相应的骨受到牵引。这些步骤发生的正确顺序是（ ）A. ②③④① B. ②①④③ C. ③④①② D. ④①②③