婴儿缺乏(),主要表现为皮肤干燥、角膜溃疡、夜盲畏光等。
A、维生素K
B、维生素B2
C、维生素A
D、维生素E
参考答案:C
The room was almost empty_______ there were some old chairs with their legs broken.[ ]
A. except for
B. except that
C. besides
D. except
半合成的15元大环内酯类抗生素是()
A.吉他霉素
B.阿奇霉素
C.罗红霉素
D.麦迪霉素
E.红霉素