---_______ does harm to your health. 

--- I will ______ and live a healthy life.

A．Smoke; give up it

B．Smoking; give up it

C．Smoke; give up smoking

D．Smoking; give it up

每只气胀式救生筏和静水压力释放器均应定期进行检修，间隔时间应不超过（）个月，但外观检查无异常时，经同意可展期到（）月.

A.12，13

B.12，17

C.6、12

D.6、17