题目:
It's difficult for me to decide which one to choose, because ______ of them are good. [ ]
A. neither
B. both
C. either
D. each
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B解析:慢性呼吸道感染性疾病、迁延性肺炎、麻疹等,在维生素A摄入不足的基础上,因维生素A消耗增加而出现症状。