听短文,回答以下各小题。短文读三遍。
17. When was chocolate first found to be eaten?
A.About one thousand years ago. | B.About two thousand years ago. | C.About three thousand years ago. |
18. Who could drink the chocolate at first?
A.The rich. | B.The old. | C.The young. |
19. The chocolate makers add ________ for taste.
A.sugar and fruit | B.milk and ice cream | C.sugar and milk |
20. When dogs eat chocolate, they will become ________.
21. Which chocolate taste the sweetest?
A.Dark chocolate. | B.White chocolate. | C.Milk chocolate. |