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（鲸）
　　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．Which words tell us what the sun is like?
　　A． Huge． B． Hot． C． Bright． D． All above．
　　2．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．
　　3．Why can we still see during the day when the sky 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．
　　4．All the food we eat comes from ______． And it starts with the _____．
　　A． plants； earth B． a food chain； sun
　　C． food； sun D． plants； star
　　5．In what way do you think the sun cannot be harmful（有害的）?
　　A． The sun can do harm to your eyes and skin．
　　B． It can make rivers too dry．
　　C． Without it there would be no life on Earth．
　　D． Hot sun on dry land can cause fires．
　　【答案与解析】本题以实例说明了太阳对地球上各种生物的重大作用.文中介绍说：太阳是一个巨大的火球,它发出的光和热对于地球上的生物有着非常重要的意义.万物生长靠太阳.动物与人类的食物都来自起始于太阳的食物链.　　1．D.答案就在短文首句的“ The sun is a huge,hot,bright star．”之中,其中包含的三个形容词正是本题的答案.　　2．A．短文首段末句和第二段的首句“The sun gives us light and heat． All living things need light and heat from the sun to live．”是解答该题目的重要依据.　　3．C．本小题属于表层理解题.答案显然在“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．”一句中.　　4．B．本小题同样属于表层理解题.“All the food we eat comes from plants in a food chain（链）which starts with the sun．”这句话是问题的出处.此句是定语从句,要仔细阅读才能正确理解.　　5．C．根据“It is important because without it there would be no life on Earth．”和“If there was no sun,it would be dark all the time．”这两句话,可很容易将其余三个选项排除.