再问个英语冠词问题The shoemaker is a person who makes or mends shoes.

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再问个英语冠词问题
The shoemaker is a person who makes or mends shoes.
An electron is a particle of very small mass.
Scientists use mice to test new medicines.
为什么第一个要用定冠词,第二个用不定冠词,第三个零冠词.三者能互换吗?

第一个也可用不定冠词
第二个用不定冠词是指任意一个电子,其含义是每个电子都有该属性；
第三个零冠词但也可以用定冠词,只不过这时是指一个特定科学家群体罢了.
除了单复数问题要区别外,用法上是可以互换的,但要注意特定和泛指的差异.

再问个英语冠词问题The shoemaker is a person who makes or mends shoes. The person who makes you happy is yourself是什么意思 1.A c____ is someone who invents or makes something （The shoemaker found a new pair of shoes on the table) when （The shoemaker tound a new pair of shoes on the table） when MY girl friend is...a person who always makes me sad and hap She is a person who doesn’t like the person who couldn‘t com The c (the person who works in the bank,or office) is coming my idea of a hero is a person who is devoted to what he or s 问英语冠词语法问题4is Anne _____ Europe or _____ American?答案给的两个都是a , 英语冠词题目_____ president is the most powerful person in the USA 几个英语小问题~~~the color of this pair of shoes is pretty.can i()A