UNIT 03 Food Chain

　　The food chain is a natural system. The first level of the food chain consists of plants. These plants are major food for grass-eating animals. These grass-eating animals are the second level of the food chain. Grass-eating animals are cows, deer, horses, and so on. These animals are food for tigers, lions, and cheetahs. These animals are the final level of the food chain。

　　Select True or False

　　❶ The first level of the food chain consists of plants. (T/F)

　　❷ The food chain is an unnatural system. (T/F)

　　❸ Grass-eating animals are the final level of the food chain. (T/F)

　　More to know

　　consist of

　　consist of 有“由……构成；由……组成”等意思。这个词组使用频

　　率非常高。

　　··Air consists of oxygen and nitrogen。

　　空气由氧气和氮气组成。

　　··This book consists of many different stories。

　　这本书由很多不同的故事构成。

　　READING COMPREHENSION

　　*Read and circle the best answer。

　　❶ What does the first level of the food chain consist of?

　　a. grass-eating animals

　　b. plants

　　c. humans

　　❷ What is a grass-eating animal?

　　a. cheetahs b. lions c. horses

　　*Complete the sentence with the right answer。

　　❸ animals are food for tigers, lions, and cheetahs。

　　a. Grass-eating

　　b. The final level of the food chain

　　c. The first level of the food chain

　　❹ These grass-eating animals are the level of the food chain。

　　a. second b. third c. fourth

　　DESCRIBE THE PICTURE

　　*Unscramble the words in the box。

　　are eating Grass-eating plants animals

　　食草动物们在吃草。