夜盲症是缺乏维生素B2的表现。
参考答案：错
— ______________ is your new computer teacher?
— Mr Liu.
A. Who's
B. Who
C. What's
对放疗中度敏感的肿瘤为
A．食管癌
B．乳腺癌
C．肺癌
D．肝癌
E．精原细胞癌
