2024年6月英语六级（第3套 · 含听力）选词填空

A rainbow is a multi-colored, arc-shaped phenomenon that can appear in the sky. The colors of a rainbow are produced by the reflection and __26__ of light through water droplets (小滴) present in the atmosphere. An observer may __27__ a rainbow to be located either near or far away, but this phenomenon is not actually located at any specific spot. Instead, the appearance of a rainbow depends entirely upon the position of the observer in __28__ to the direction of light. In essence, a rainbow is an __29__ illusion.
Rainbows present a __30__ made up of seven colors in a specific order. In fact, school children in many English-speaking countries are taught to remember the name "Roy G. Biv" as an aid for remembering the colors of a rainbow and their order. "Roy G. Biv" __31__ for: red, orange, yellow, green, blue, indigo, and violet. The outer edge of the rainbow arc is red, while the inner edge is violet.
A rainbow is formed when light (generally sunlight) passes through water droplets __32__ in the atmosphere. The light waves change direction as they pass through the water droplets, resulting in two processes: reflection and refraction (折射). When light reflects off a water droplet, it simply __33__ back in the opposite direction from where it __34__. When light refracts, it takes a different direction. Some individuals refer to refracted light as "bent light waves." A rainbow is formed because white light enters the water droplet, where it bends in several different directions. When these bent light waves reach the other side of the water droplet, they reflect back out of the droplet instead of __35__ passing through the water. Since the white light is separated inside of the water, the refracted light appears as separate colors to the human eye.