UNIT 04 Valley

　　Have you been to a nice valley between big mountains? If you see many mountains in your country, you also have many valleys. If you go to a very clean valley, you can find a lot of living things in valleys, such as crawfish, various small fish, and even otters.  Crawfish can only live in very clean water. If you find a crawfish, that valley must be very fresh。

　　Select True or False

　　❶ Crawfish don’t live in valleys. (T/F)

　　❷ There are many living things in valleys. (T/F)

　　❸ Valleys are usually near the ocean. (T/F)

　　More to know

　　must

　　must有“一定”的意思。在确信某件事情的时候使用。

　　··You must be hungry。

　　你一定很饿。

　　··He must be at home。

　　他一定在家里。

　　READING COMPREHENSION

　　*Read and circle the best answer。

　　❶ What can you see if there are a lot of mountains in your country?

　　a. valleys b. oceans c. deserts

　　❷ What can you find if you go to a clean valley?

　　a. sand and water b. rocks and stones c. living things

　　*Complete the sentence with the right answer。

　　❸ can only live in very clean water。

　　a. Humans b. Wild animals c. Crawfish

　　❹ If you find a crawfish, that valley must be very 。

　　a. fresh b. dirty c. hard

　　DESCRIBE THE PICTURE

　　*Unscramble the words in the box。

　　the rock An otter on is

　　水獭在岩石上面。