更多"When we speak，sound waves begin to "的相关试题:
[单项选择]When we speak, sound waves begin to travel and go in all directions.
A. 当人们说话时，声音向四面八方传开。
B. 当我们说话时，声音就开始传播，并且向四面八方传开。
C. 当我们说话时，声波开始传递，而且向四面八方传播。
D. 当说话时，声波就开始旅行，并且走向四面八方。
[单项选择]When we speak，sound waves begin to travel and go in a11 directions．
A. 当人们说话时，声音向四面八方传开。
B. 当我们说话时，声音就开始传播，并且向四面八方传开。
C. 当我们说话时，声波开始传递，而且向四面八方传播。
D. 当我们说话时，声波就开始传播，并且走向四面八方。
[单项选择]Be sure to （ ） your wife when we go to the party this evening.
A. get
B. bring
C. carry
D. take
[单项选择]Be sure to ______ your wife when we go to the party this evening.
A. get
B. bring
C. carry
D. take
[单项选择]Sound waves reflected from a hill can be used to calculate the______.
A. Speed of sound
B. time between a sound and ifs echo
C. height of the hill
D. distance of the hill
[单项选择]Sound waves reflected from a hill can be used to estimate______.
A. height of the hill
B. speed of sound
C. distance of the hill
D. intensity of sound
[填空题]The moon is a very silent world, for sound waves can only travel through the air（）.
[单项选择]Under proper conditions, sound waves will be {{U}}reflected{{/U}} from the hillside or other such obstruction.
A. mirrored
B. bounced back
C. absorbed
D. soaked through
[单项选择](Sound waves) travel (in the air) in much (the same) way (like) water waves spread on the water.
A. Sound waves
B. in the air
C. the same
D. like
