There is so much smoke in the air that it is (23)………to live in many of the world’s cities. In one well-known city, for example,Đoạn văn23/30There is so much smoke in the air that it is (23)………to live in many of the world’s cities. In one well-known city, for example,healthy unhealthy healthful HealthilyGiải thíchChọn đáp án B