题目：
完形填空（15分） __41__ New Year’s Day, many people eat special food for good luck. In Spain and some Latin—American counties , people __42__ twelve grapes（葡萄）at midnight on New Year’s Eve—one grape __43__ good luck in __44__ month of the new year. Chinese people eat __45__ .Some have coins（硬币）inside. Everyone __46__ to find the coin for luck and money in the new year. Of course they don’t eat the __47__ . Japanese __48__ eat noodles on New Year’s Eve and their birthdays . __49__ may bring them good luck and __50__ life. 小题1:
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答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：根据质量守恒定律的微观解释：在化学反应前后，原子的种类、个数都不变，不难推出X的化学式是N2O4，故选A
Fe3O4