Mark the letter A, B, C, or D on your answer sheet...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions: Factories discharge much of the material that pollutes the air and water, but factories give employment to a large number of people.

A. unload

B. burn

C. give off

D. take in