听下面一段独白,回答以下小题。
17. Which is NOT a benefit of the minerals and vitamins found in bananas?
A.Controlling blood pressure. | B.Aiding muscle movement. | C.Keeping off cold. |
18. What effect can bananas have on people's emotions?
A.They make people high-spirited. | B.They make people low-spirited. |
C.They make people less emotional. |
19. What will happen if a banana is placed in a refrigerator?
A.Its appearance will remain the same. | B.It won't go bad quickly. |
C.Its flesh will turn dark soon. |
20. What does the banana industry try to tell people?
A.Don't place bananas in the refrigerator. |
B.It's not true that bananas can keep you young. |
C.Bananas can be well preserved in the refrigerator. |