1.skeptical a．怀疑的(suspicious)
例：The tone of the passage was skeptical and questioning.
派生词：skepticism(n．怀疑论)；skeptics(n.怀疑论者；无神论者)
2.sketch n．草图，素描(draft);v.画速写
例：field sketch作业草图，现场草图
派生词：sketchy(a．粗略的)
3.skull n．头骨(the skeleton of the head)
联想记忆：据说大脑壳(skull)的人掌握技能(skill)比较快
例：The skulls, pelvises（骨盆）and hind feet of pterosaurs（翼龙）are reptilian.
4.slam v.猛烈撞击(to knock)；砰地关上（to shut noisily）
发音记忆：“死拉门”--使劲关--砰地关上
例：The colossal object from space cut through the atmosphere and slammed into Earth.
5.slice n．薄片，切片(a thin flat piece cut from something)；部分(portion, share)
记：和sly（a．狡猾的）一起记
例:Mary put a slice of ham on her sandwich.//Taxes take a large slice of my income.
6.slick a．光滑的(slippery)；聪明的(clever)
例：The roads are slick with ice tonight.//Everyone laughed at John's slick response to Dave's insult.
7.slight a．少量的(thin)；微不足道的(trivial)
联想记忆：s+light(轻的)--轻微的—微不足道的
例：Products with slight manufacturing defects may hinder their sales.//The documentation of this epidemic was slight.
派生词：slightly( ad.少量地)
8.slip n.纸片(a small piece of paper);差错(error);v.滑行(to slide);下降(to decline)
注意：slipper(n．拖鞋)
例：There were ten numbers written on a slip of blank paper.//Corporate profits slipped severely during the recession.
9.slope n．斜坡(ramp);【数】斜率(The rate at which an ordinate of a point of a line on a coordinate plane changes with respect to a change in the abscissa.)
例：continental slope大陆坡