化学与生活密切相关．生活中的下列做法或说法不合理的是（　　）

A．农业上超量使用化肥农药不会造成水体污染

B．活性炭具有吸附性，可做新装修房间的除味剂

C．用活性炭吸附的方法可将硬水软化成软水

D．用硬水洗涤毛巾，时间长了毛巾会变硬

If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.

A.fire a green star to the left

B.send the letter K by light and point to the left

C.place an orange signal to your left as you signal with a white light

D.send the code signal S followed by L