'___________' means 'made by humans'.
Đáp án đúng là: C. artificial
Giải thích:
Từ 'artificial' trong tiếng Anh có nghĩa là 'nhân tạo', tức là được tạo ra bởi con người, không phải tự nhiên. Các lựa chọn khác có nghĩa là 'có giá trị', 'hữu ích', 'giúp ích'.
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