B
Why Is the Sun Important?
The sun is a huge, hot, bright star. It is important because without it there would be no life on earth. The sun gives us light and heat.
All living things need light and heat from the sun to live. Plants need light and heat to grow. They use the light from the sun to make food. We cannot make our own food, but plants can. All the food we eat comes from plants in a food chain(链） which starts with the sun. For example:

Animals need sunlight, too. Just like us, their food comes from a food chain which begins with the sun and the plants.
Sun→leaf→caterpillar(毛虫）→bird
Sun→seaweed(海藻）→small fish→whale
Sunlight means we can see during the day. If there was no sun, it would be dark all the time. Even when the sky is cloudy, the sunlight is very strong and it shines through the clouds.
根据材料内容选择最佳答案。
()11. Which word(s) can tell us what the sun is like?
A. Huge. B. Hot.
C. Bright. D. All of the above.
()12. What are the two main things the sun gives us?
A. Light and heat. B. Heat and eggs.
C. Corn and light. D. Wheat and bread.
()13. Why can we still see during the day when it is cloudy?
A. Because we can see all day and all night.
B. Because the sun can't give us light all day long.
C. Because the sunlight can shine through the clouds.
D. Because we can't see at night.
()14. All the food we eat comes from . And it starts with the .
A. plants; earth B. plants; sun
C. food; sun D. plants; star
()15. Which of the following is right according to the text?
A. The sun can do harm to your eyes and skin.
B. The sun can make rivers too dry.
C. Without the sun, there would be no life on earth.
D. Hot sun on dry land can cause fires.

11.D 12.A 13.C 14.B 15.C