题目

---All the people of Dazhou need to work together to make our city more beautiful.    ---That’s it . _______.  A . Practice makes perfect                      B. Many hands make light work.  C. When in Rome, do as the Romans do D. A friend in need is a friend indeed. 答案：B胸大肌的一端附着在胸骨上，另一端附着在上臂的肱骨上端，当胸大肌收缩时产生的动作应该是（ ）A．外展上臂 B．内收上臂C．挺胸 D．内收前臂