All the students went to the Blue Water Aquarium _______ Lucy because she was ill in hospital.
A:beside
B:expect
C:besides
D:except
有“世界屋脊”之称的高原是( )
在桌面上扬些碎纸屑并用力敲击桌面,我们看到纸屑在桌面上“跳舞”,同时能听到敲桌子发出的声音。这说明发声的物体在____ ;纸屑“跳舞”说明声音能传递____ 。