先天性甲状腺功能减低症的治疗中，错误的是

A．需甲状腺素终生治疗

B．临床症状改善，T₄、TSH正常，此时甲状腺素剂量可作为维持量

C．甲状腺素治疗维持到青春期即可停药

D．甲状腺素自小量开始逐渐增加剂量

E．出生后1～2个月开始治疗，可不遗留神经系统损害

We are taught that a business letter should be written in a formal style ________ in a personal style.[ ]

A. rather than  

B. other than

C. better than  

D. more than