题干
I’ll show you a market ________ you may buy all ________ you need.
A：in which ; /
B：which ; that
C：where ; which
D：that ; that
答案(点此获取答案解析）
A
齐排列的等腰直角棱镜（折射率
）组成，棱镜的横截面如图所示。一平行于横截面的光线从
点垂直
边射人棱镜，先后经过
边和
边反射后，
点射出，则出射光线是
