— _______ expensive mobile phone it is！

—Yes, but I think _______ style is quite fashionable.

A．What a；a

B．How；the

C．What an; the

D．How an; the

维生素D缺乏性佝偻病不正确的预防措施是

A．适当多晒太阳

B．提倡母乳喂养

C．孕母补充维生素D及钙剂

D．及时添加辅食

E．早产儿2个月开始补充维生素D