听力原文：

G: Nick, I want to make a banana milk shake. Can you tell me how?

B: Sure. First, peel the bananas. Next, put the bananas into the blender. Then, pour the yogurt into the blender. Finally, turn on the blender.

G: How many bananas do we need?

B: We need four bananas.

G: How much yogurt do we need?

B: We need two cups of yogurt.

参考答案：1. C