He took my English-Chinese dictionary _____ mistake. [ ]
A. to
B. by
C. about
D. on
答案:B
观察病色的关键在于分辨面色的善恶还是主色与客色?
睾丸鞘膜积液的最佳治疗方法是
A.中药治疗
B.硬化剂注射疗法
C.手术治疗
D.等待观察
E.物理治疗