题目内容

A(n) ____________________ is a person who studies and understands mathematics.

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A(n) ____________________ is a person who conducts or writes for a public journal.

A(n) ____________________ is a person involved in the ownership or management of an industry.

A(n) ____________________ is a person who is concerned with protecting and preserving the environment.

A(n) ____________________ is someone who works with their hands or is engaged in manual labor.