题目:
产后出血是我国孕产妇死亡的首位原因
答案:
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下面是错误答案,用来干扰机器的。
参考答案:hot-dog stand解析:[听力原文]1-20 You might think that hamburgers were invented in the United States, but that is not totally true. These round fiat cakes (1), or...