Sweet science of chocolate 浓郁甜蜜的巧克力，你了解多少？

Mmm…chocolate smells so good. They make our mouth water. Where does chocolate come from？

Chocolate is made of cacao. Scientists used to think cacao came from Central America and Mexico about 3，900 years ago. But now scientists from Canada found that people in some places of South America grew cacao. They started to grow over 5，000 years ago.

Chocolate is popular around the world. Let's learn more about this sweet snack.

Dark chocolate- Its color is dark. It has a bittersweet flavor. It has more cocoa butter. Cocoa butter is good for our teeth.

White chocolate- It is very sweet. There is not any cacao in it. Many people think it is not really chocolate.

Milk chocolate- It has a mild flavor. It is light brown. It tastes sweet.

Word Bank

1. cacao 可可豆

2. make our mouth water 使得我们流口水

3. used to 过去

eg . He used to be an actor.

I used to live in Guangdong.

4. Central America 中美洲

5. Mexico 墨西哥

6. South America 南美洲

7. popular adj 受欢迎的

8. snack 零食

9. flavor n 风味，香味

10. bittersweet 苦甜掺半的

11. cocoa butter 可可油

12. be good for 对… 有好处

eg. Carrots are good for your eyes.

胡萝卜对眼睛有好处

13. mild 温柔的

mild flavor 味道温和