英语冠词使用的问题刚才做听力，看到这两个句子Often a cat or a dog can comfort us at

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英语冠词使用的问题
刚才做听力，看到这两个句子Often a cat or a dog can comfort us at times when human words just don't help.
第二个：
A pet can be something different to each member of the family, another baby to a mother and father, a sister or brother to an only child,
问题：第一句a cat or a dog和第二句的 a mother and father, a sister or brother 为什么前者前后都有冠词而后者没有？省略？平行结构？都说不通啊，就是搞不懂为什么第二句不加冠词，求大神解答。谢谢！
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两个词同指一物或一人时只用一个a ，指两件物品或两个人时，两个词分别用 a.第一句是一只猫或一条狗；第二句是指对母亲或父亲{不知道读者是男人还是女人}，就好比我们汉语中说话-----例如：如果有人来找我，请告诉他（她）我下午三点回来一样。希望我的讲解能帮到你！

英语翻译You may have a dog,a cat,or a bird as your pet ,but can Do you have a dog ,a cat or birds at home?Do you ( )them car 问英语冠词语法问题4is Anne _____ Europe or _____ American?答案给的两个都是a , 英语作文：A cat and a dog which is better to have ,a dog or a cat Which is bigger,a cat or a dog? a cat and dog life 英语意思英语冠词问题一般的人名前不是不加冠词么?可是,有两个句子 A Xiao Ming is waiting for you. 一篇英语首字母填空You may have a dog,a cat,or a bird as your .p.,but 英语冠词（a/an）的问题英语改句子问题~求解66、 A traffic accident often occurs at a crossroad A cat can look at the king.这是名言.