2025年单元自测试卷青岛出版社九年级英语上册人教版第41页答案
A

(
B
)1. What is the experiment of making cup phones designed to show?
A. How sound travels through air.
B. How sound travels through string.
C. How to change air into sound.
D. How to change sound into electricity.
(
B
)2. How many steps do you need to make cup phones?
A. Two.
B. Three.
C. Four.
D. Five.
(
A
)3. What is a thumbtack used to do?
A. To make a hole in the bottom of each cup.
B. To connect the two cups with the string.
C. To pull the string tight to make the sound.
D. To tie the string to the bottom of each cup.

答案

1. B
2. B
3. A