Trắc nghiệm: The earth is the only planet with a large number of oxygen in its atmosphere. ,The earth is the only planet with a large number of oxygen in its atmosphere. ,The earth is the only planet with a large number of oxygen in its atmosphere. ,The earth is the only planet with a large number of oxygen in its atmosphere.,The earth is the only planet with a large number of oxygen in its atmosphere.,The Earth is the only planet with a large number of oxygen in its atmosphere.