Listen to part of a science talk about the colour of the sky. – Luyện nghe VSTEP Part 3 – Bài nói, bài giảng

1. What does the speaker say about sunlight?

A. It is mainly blue.B. It is a single colour.C. It is a mixture of all the colours.D. It has no colour at all.

2. Which colour has the longest waves?

A. whiteB. blueC. violetD. red

3. Why do we see blue light all over the sky?

A. The sea reflects blue light into the sky.B. Gas particles scatter short waves much more than long waves.C. Clouds are made of blue particles.D. The sun gives off mostly blue light.

4. Why isn't the sky violet, according to the speaker?

A. Our eyes are more sensitive to blue.B. There is no violet in sunlight.C. Violet waves are too long.D. Violet light is absorbed by clouds.

5. Why are sunsets red?

A. The sun becomes cooler in the evening.B. The sun is closer to the Earth.C. Dust from the ground turns the light red.D. The light travels through more air, so most blue is scattered away.