题干
In order to _____ the rising production costs, the subscription rates have been increased.
A：add up to
B：look up to
C：cut short
D：keep up with
答案(点此获取答案解析）
D
）,且与y轴交于点C（0,2）,与x轴交于A,B两点（点A在点B的左边）．