【单选题】听力原文: Our environment is being polluted faster than the nature and man's present efforts can pr it. Time is bringing us more people, and more people will bring us more industry, more motor vehicl...
A.
It's because there are many developing nations.
B.
It's because people use too many man-made materials.
【单选题】听力原文: Our environment is being polluted faster than the nature and man's present efforts can pr it. Time is bringing us more people, and more people will bring us more industry, more motor vehicl...
A.
It's because there are many developing nations.
B.
It's because people use too many man-made materials.