A:不变
B:增大
C:减小
D:先增后减
①540÷36=
②307×28=
③714÷42=
④309×28=
⑤*588÷28=
⑥600×35=
每年农历立春前后,我国北方松江平原还是冰天雪地的时节,南方海南岛却已经春意盎然,南北季节差异明显,其主要原因是( )
Many people cut down trees ____ (make) more money.