—Mom, can I leave my homework for tomorrow?

—I'm afraid not. Don't _______ what you can do today till tomorrow. [ ]

A. put on

B. put down

C. put up

D. put off

下图左为两种地质现象示意图，图右为华北某地区等高线地形图。结合图文材料，回答1~2题。

1、发生左图所示两种地质现象共同的必要条件是[ ]

A、突发地震

B、坡度较大的山地

C、连降暴雨

D、地表堆积物较多

2、右图所示的四处房屋，阳光射入时间最长，且受左图所示地质灾害威胁最小的是[ ]

A、a

B、b

C、c

D、d