护患关系概念是指在特定条件下。通过医疗、护理等活动与患者建立起来的一种特殊的人际关系。这种关系的实质是（ ）的关系。
参考答案：帮助与被帮助
—Peter, where did you guys go for the summer vacation?
—We ____ busy with our work for months, so we went to the beach to relax ourselves.
A．had been
B．have been
C．were
D．will be
类风湿关节炎滑膜的病理特征是（）
A.血管翳形成
B.滑膜水肿
C.淋巴细胞浸润
D.滑膜增厚
E.滑膜消失或变薄
