题干
Barbie is walking the river bank with her sister.
A：along
B：across
C：through
答案(点此获取答案解析）
A
Barbie is walking the river bank with her sister.
A：along
B：across
C：through
试液，通直流电，一段时间后U形管内会形成三色“彩虹”的现象，它从左到右颜色的次序是：（ ）