A:随着工业的发展,导致大量温室气体排放,全球气温升高
B:随着光合生物的出现,大气中有了氧气,为好氧生物的出现创造了条件
C:生活在草原上的斑马和猎豹都能迅速奔跑,是长期相互选择的结果
D:4亿年前形成了原始的陆生植物,随后出现了适应陆地生活的动物
There are forty-eight students in our class. There are twenty-three boys and twenty-five girls. Some students live near the school, and some others live very far from the school. About half of the students come to school by bike. They often get to school at a quarter to seven. About ten students often come to school by bus. They often go to school very early, too. Another ten students come to school on foot. Their homes are near the school, but they are often late for school, because they get up very late.