应用鹰嘴钳拔下前牙时，术者应站在患者
A．左侧后方
B．右侧前方
C．右侧后方
D．左侧前方
E．正后方
参考答案：B
_____ it was very cold, _____ my friend still went swimming in Jialing River this morning.
A．Although; but
B．Although;/
C．But; although
D．/;although
目前认为与直肠癌发生无关的因素是
A．痔
B．溃疡性结肠炎
C．日本血吸虫病
D．高蛋白高脂肪饮食
E．直肠腺瘤
