UNIT 05 Pearl Oyster

　　Do you know where pearls come from? Expensive jewels usually come from big mines. However, believe it or not, pearls come from pearl oysters in the sea. Nowadays, we can raise pearl oysters in the seas near Korea and Japan. Pearl oysters are usually 5 cm long and 5.6 cm high. When we raise pearl oysters, it is very important to maintain a water temperature over 10°C。

　　Select True or False

　　❶ Expensive jewels are often from a factory. (T/F)

　　❷ Expensive jewels are often from deserts. (T/F)

　　❸ Expensive jewels are often from big mines. (T/F)

　　More to know

　　however

　　however有“可是；然而”的意思。讲述和前面相反的内容时使用。

　　·· I wanted to have a pet dog. However, my dad bought a

　　pet cat。

　　我想要一只宠物狗，可是爸爸却买了一只宠物猫。

  　READING COMPREHENSION

　　*Read and circle the best answer。

　　❶ Where do pearls come from?

　　a. under the ground b. the sky c. the sea

　　❷ How big is a pearl oyster?

　　a. 3 cm long and 3.6 cm high

　　b. 5 cm long and 5.6 cm high

　　c. 7 cm long and 7.6 cm high

　　*Complete the sentence with the right answer。

　　❸ We can raise pearl oysters in the seas near 。

　　a. Korea and Japan

　　b. America and Mexico

　　c. Italy and France

　　❹ When we raise pearl oysters, it is very important to maintain a

　　water temperature over °C。

　　a. 5 b. 10 c. 15

　　DESCRIBE THE PICTURE

　　*Unscramble the words in the box。

　　wide oyster A pearl opens

　　珍珠贝张开了外壳。