糖尿病性血管病变，最具有特征性的是
A．合并高血压
B．常伴冠状动脉粥样硬化
C．微血管病变
D．周围动脉硬化——下肢坏疽
E．脑血管病变
参考答案：C
鱼必须生活在水中，离开水一段时间会死亡，对此现象最好的解释是
A．生物适应环境
B．生物依赖环境
C．环境影响生物
D．生物影响环境
27. Our headmaster felt fairly happy today because ten students were praised at the meeting, _____three were from our school.
A．for them
B．of whom
C．of them
D．of that
