题目:
凡麻疹疑似病例出疹后多少天内采集的血标本检测麻疹IgM抗体阴性,应采集第2份血标本?()
A.4天;
B.2天;
C.3天;
D.28天。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A解析: 这是道细节题。根据文中第一段的“However, what most people want to know about extinct animals is what they looked like when they were alive. Scientists also w...