题目内容：

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.

1.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.

2.Why can we still see during the day when the sky is cloudy？

A. Because the clouds gives the light.

B. Because the sun can't give us light all day long.

C. Because the sunlight can shine through the clouds.

D. Because the sunlight can shine through the chain.

3.All the food we eat comes from ______. And it starts with the _____.

A. plants; earth       B. a food chain; sun

C. plants; sun       D. plants; star

4.In what way do you think the sun cannot be harmful？

A. The sun can do harm to your eyes and skin.

B. The sun can sometimes make rivers too dry.

C. Without it there would be no life on Earth.

D. Hot sun on dry land can cause fires.

5.From the food chains given in the passage, we can know _____.

A. Whales like eating seaweed most

B. A caterpillar’s favourite food is bread

C. Small birds live mainly on caterpillars

D. The food hens eat comes from potatoes