弦轴板的主要作用是保证钢琴的（）性。
参考答案：音准稳定性
填一填，根据图画提示填单词。
1. Close your b_____________ . Please listen.
2. He has a new b_____________ , and there is a p_____________ in it.
3. My p_____________ are very cool.
4. Li Ming is a s_____________ .
5. He goes to school by b_____________ .
6. I want to fly a k_____________ in spring.
7. Do you have any r_____________ ?
8. We make a snowman in w_____________ .
9. There are all kinds of food. My favourite food is h_____________ .
10. We plant some t_____________ in spring.
衡量物价稳定的宏观经济指标是消费投资比例。( )
. Please listen.
, and there is a p_____________ 
in it.
are very cool.
.
.
in spring.
?
.
.
in spring.