Day 7-冲刺2021年中考英语完形填空提分必练之科普知识与现代技术

Day 7 A Have you ever seen a rainbow in the sky? Do you know what it is? A story says that when you see a rainbow you should 1 at once to the place where it touches the ground, and 2 you would find a bag of gold. Of course, it is not 3 . You could not find the bag of gold, nor could you ever find its end. No matter how 4 you run, it always seems far away. A rainbow is not a thing which we can feel with our hands as we can feel flower. It is only the effect of light shining on raindrops. The raindrops catch the sunlight and break it up into all the wonderful colors 5 we see. It is 6 a rainbow perhaps because it is made up of raindrops and looks like a bow（弓）. That is 7 we can never see a rainbow in a clear sky. We see rainbows 8 when there is rain in the air and the sun is shining brightly through the clouds. Every rainbow has many 9 in the same order. The first of the top color is always red, next 10 orange, then green, and last