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  3. China’s fourth national economic census will be carried out from January to June

China’s fourth national economic census will be carried out from January to June

游客2023-12-24  31
问题 China’s fourth national economic census will be carried out from January to June in 2019. [br]  
China’s fourth national economic census will officially begin on the first day of 2019. The survey, which will last three months, will cover all businesses involved in secondary and tertiary industries.
It was not until McCollum and Davis undertook a series of experiments on rats from 1912 to 1914 that vitamin A was described for the first time.
选项 A、True
B、False
答案 B
解析 事实细节的找寻与判断。原文中“experiments on rats”表明维生素A是在老鼠实验中得到首次描述的，并且实验时间段为1912到1914年。题干中所述，即自1912年起维生素A就已经在人体中进行研究，与原文对照，此陈述不合理。因此，该题的说法是错误的。准确把握篇章内的关键词汇，结合语义逻辑进行判断。
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