The air is naturally contaminated by foreign matter such as plant pollen and dust. A. concentrated B. occupied C. filled D. polluted
Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
The air is naturally contaminated by foreign matter such as plant pollen and dust.
A. concentrated
B. occupied
C. filled
D. polluted