一本书现价6元比原价降价2元，售价降低了百分之几？
2÷（6+2），
=2÷8，
=0.25，
=25%；
答：售价降低了25%．
大隐静脉曲张术后常见的并发症是（）。
A.出血
B.泌尿系感染
C.感染
D.血栓性静脉炎
E.褥疮
根据图片内容，填入适当介词
1. I like running _____ the mormng.
2. There is an orange _____ the desk.
3. We will meet _____ eighto'clock.
4. An eraser is _____ the pencil case.
5. Sometimes I can't sleep _____ night.
6. Tom is _____ his bike.
