耳下结节样肿块首先考虑为（）
A.耳下淋巴结
B.皮脂腺囊肿
C.神经鞘瘤
D.腮腺多形性腺瘤
E.脂肪瘤
参考答案：D
If you have some trouble ______ these sentences, ask me for help please. [ ]
A. speak
B. to speak
C. speaking
D. to speaking
镉试剂2B分光光度法测定水中银时，镉试剂2B.－乙醇溶液配制中产生的沉淀用（）方法去除？
A.过滤
B.澄清
C.萃取
