听力原文：

G: What’s up, Daniel? You look down today.

B: I got a “C” in the math exam again. What do you think I should do?

G: Well, math is a “paper tiger”. Its natural enemy is practice.

B: I practice a lot every day.

G: Well, I suggest that you ask your math teacher to explain what you can’t understand after class. You should be confident and believe in yourself．　　

B: I see. I’ll give it a go. I hope I will make progress soon．

Question: What is math’s natural enemy?

参考答案：

Math’s natural enemy is practice.