50. The Englishman has a very good ear _____ music. You can ask him for some advice.

A．at

B．of

C．for

D．In

女，43岁。患甲状腺功能亢进3年，经多方治疗病情仍难控制，需行甲状腺部分切除术，正确的术前准备应包括

A．术前两周给予丙硫氧嘧啶+普萘洛尔

B．术前两周给予丙硫氧嘧啶+小剂量碘剂

C．术前两周给予丙硫氧嘧啶+大剂量碘剂

D．术前两周给予丙硫氧嘧啶

E．术前两周给予卡比马唑