--what effect does the medicine have          the blood pressure ?

--- well ,it depends         how much you take .

A．with ;on

B．with ; to

C．on ; on

D．on ; to

阅读《山居秋暝》回答下列问题：空山新雨后，天气晚来秋。明月松间照，清泉石上流，蓬动下渔舟。随意春芳歇，王孙自可留。

诗中哪几句使用了对仗？