在使用小提琴前，乐师常旋动琴弦轴以调节琴弦的松紧，俗称“定弦”，这主要是为了改变声音的（ ）
A：振幅
B：响度
C：音调
D：音色
下列有关地图的叙述，正确的是（ ）
A. You're welcome.
B. What shape would you like?
C. I'd like some cherries, too.
D. What kind of pudding would you like?
E. Yes. I want to buy a pudding.
A: Can I help you?
B:____
A:____
B: I'd like a chocolate pudding.
B: I'd like a heart-shaped pudding.
A: Anything else?
B:____How much are they?
A: 70 yuan.
B: Here is the money.
A: Thank you.
