题目

They have been married for nearly two years and they are ________ to have a baby. However, their wish hasn't come true. A . cautious B . desperate C . contradictory D . unwilling 答案：B人体完成呼吸运动的主要肌肉是A.胸大肌B.腹部肌肉C.背部肌肉D.肋间肌和膈肌