A:手影说明光在同种均匀介质中沿直线传播
B:现场观众听到的声音是通过空气传播的
C:演员模仿的是动物叫声的音调
D:居民家中彩色电视机屏幕上的丰富色彩是由红、绿、蓝三种色光混合而成
Jane's grandmother wanted to write children's book for many years, but one thing or another always got in way.