骨、关节、肌肉三者关系示意图正确的是（ ）
A． B． C． D．
答案：D
骨骼肌的两端附着在相邻的骨上。
中国城市社区服务的发展方向发生转折的标志是（）。
Can you see that building ______ by trees? That’s ______ we study.
A．surrounded; which
B．surrounding; where
C．to be surrounded; in which
D．surrounded; where
