给高热患者用冰帽降温是通过增加（）
A．辐射散热
B．传导散热
C．对流散热
D．蒸发散热
E．发汗
参考答案：B
— Do you know our town at all?
— No, this is the first time I _____ here. [ ]
A. was
B. have been
C. came
D. am coming
用40厘米长的铁丝分别围成长方形、正方形、圆，面积最大的是[ ]
A．长方形
B．正方形
C．圆
