usually (usual) celebrated with a big family meal. The tradition is that the "birthday boy" or "birthday girl" should fill their mouth with as many long noodles 9. as they can and then eat them. This is because in Chinese culture, long noodles are a symbol 10. of long life. 13....
根据题干关键词asourceoffuel定位到第一段最后一句。该句前面提到人们最初仅仅将从石油中提炼出来的煤油用来照明,而汽油和柴油这些副产品的用途并没有被发现。第一段最后一句说,多亏了几年后内燃机的发明,才没有长时间地将汽油和柴油这些副产品浪费掉。由此可知,是内燃机的发明使人们意识到了石油可以作为燃料来使用...
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