文档文本内容
1
大招课内部资料
阅读理解之高级题目讲练1
Many of us have seen rainbows in the sky once the sun stars shining again after it
rains. For us to see a rainbow, the conditions need to be just right. We need some
water drops in the air, like rain or even fog and we need the sun to be behind us and
quite low to the ground. This is because a rainbow is created by light passing through
water drops.
The light that comes from the sun seems quite to us. But the white light we see is
made up of a mix of different colors. When the light goes through a raindrop, these
colors can separate out.
Each of the colors in the rainbow has a different "wavelength(波长)". Raindrops
look like little balls. When light hits one of these little balls of water, the light can
change direction. We call this "refraction(折射)". Each of the different wavelengths is
refracted differently. If the light hits the raindrop at the right place, the refraction
separates the wavelengths out into their different colors.
We are taught there are seven colors: red, orange, yellow, green, blue, indigo and
violet. But this isn't exactly true. Blue and green are next to each other in the rainbow,
which is why we can see the turquoise (a mix of blue and green). Brown is a mix of
red and green. But they aren't next to each other in the rainbow, so we don't see the
mix to make brown.
We would never see black and white in a rainbow. Black is what we see when
there's no light at all. On the other hand, white is a mix of all the colors together.
2
大招课内部资料
When night is refracted by raindrops, it separates the white light out, meaning it is no
longer white.
1.We can see a rainbow under the right conditions because .
A.the raindrops are like little balls
B.the light goes through raindrops
C.the sunshine seems to be colorful
D.the weather is foggy after it rains
2.According to the passage, what can we know about the colors in the rainbow?
A.They can become brown and black. B.There are seven colors in all.
C.They mix to make the white light.
D.Their own places can be changed.
3.Which part of a magazine may this passage be taken from?
A.Science.
B.Health.
C.Culture.
D.Fashion.
4.What’s the best title for the passage?
A.How Are the Colors Received in the Rainbow?
B.When Can the Colors Turn Blue in the Rainbow?
C.Which Colors aren’t Covered with Light in the Rainbow?
D.Why Can’t We Find White, Black and Brown in the Rainbow?
