题目内容

There is a (mix) _____ of many different nationalities in America.

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The newly coming manager has enriched working (experience) _____ in the realm of sales.

But when you go (close) ____ , you can see 1,888 photos of Chinese people.

_________________，用于返回对拥有指定id的第一个对象的引用。

_________________，用于返回带有指定标签名的对象集合