既能息风止痉，又能攻毒散结，通络止痛的药物是（）
A.天麻
B.地龙
C.全蝎
D.僵蚕
E.钩藤
参考答案：C
简述食管癌的诊断手段及鉴别诊断方法。
— What's this?
— _____ an orange. [ ]
A. It's
B. Its
C. That's
D. This's
