硬胶囊囊壳中甘油的作用是（）
A.遮光剂
B.增稠剂
C.防腐剂
D.增塑剂
E.矫味剂
参考答案：D
They became friends again that day. Until then, they _____ to each other for nearly two years.
A．won't speak
B．haven't spoken
C．hadn't spoken
D．haven't been speaking
格式塔原则，又称作（）原则。
A.形式变形
B.形式完成
C.完形内容
D.完形形式
