A.缝衣针悬浮在液面上是由于液体浮力的作用
B.多晶体的物理性质是各向异性的
C.液晶的光学性质具有各向异性
D.晶体有确定的熔点
CD
Let's go to _____ cinema-that'll take your mind off the problem for _____while. [ ]
A. the; the
B. the; a
C. a; the
D. a; a