平车运送法的注意事项是（）。

A.患者头位于小轮端

B.骨折患者平车上垫木板

C.上下坡时头位于高处

D.有输液和引流管时须保持通畅

E.吸氧患者用氧气枕

He thought ________ of the love that had made him sad.[ ]

A. for an instant  

B. of an instant

C. about an instant  

D. over an instant