下列单词中划线部分的读音不同于其他三项的一项是:
I think swimming is ______ hiking.
---Do you know mother giant pandas have only one or two babies ?----Sorry,I don’t know.
He _______ high school next year.
_______ trees have been planted near here, so the air is very fresh.
I guess Tom and his sister Celia enjoyed ______ at the party.