--You will get into big trouble ____ you can’t prove that you didn’t cheat in the exam.

--I know. I will collect enough evidence to make them believe me.

A．unless

B．when

C．although

D．while

设计合理、造型与名称贴切、寓意深远是（）花台设计与摆放的原则。

A、象形

B、梅花形

C、七星

D、植物