A(n) ____________________ is someone whose job is to entertain people by performing magic tricks.
查看答案
A(n) ____________________ is a person who studies and understands mathematics.
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.