When he left ______ college, he got a job as ______ reporter in a newspaper office.

A．不填; a

B．不填; the

C．a; the

D．the; the

在下列现象中，可以成为地球自转的证据是[ ]

A．日月升落

B．极昼极夜

C．月相变化

D．四季转换