listening and speaking----very important when we learn a foreign language.A are B is ,为什么谢谢

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listening and speaking----very important when we learn a foreign language.A are B is ,为什么谢谢
listening and speaking----very important when we learn a foreign language.A are B is ,为什么谢谢

listening and speaking----very important when we learn a foreign language.A are B is ,为什么谢谢
is 因为前面都是抽象名词 全市不可数所以是单数