对大跃进和人民公社化的叙述错误的是（ ）
A：违背客观经济规律办事
B：“左”倾错误泛滥
C：工农业生产停滞
D：国家和人民遭受建国后从未有过的困难
—I usually go to school by bike.
—_______
希腊文明勃兴的因素中最重要的客观条件是（ ）
The doctor is skilled at treating heart trouble and never accepts any gift from his patients,so he has a very good_____．
