
【名词&注释】
被动语态(passive voice)、第三人称(third person)、障碍物(obstacle)、环境温度的影响(environment temperature effect)、声音的传播速度
[单选题]下列关于声音的产生和传播的说法中,正确的是( )
A. 声音都是靠空气来传播的
B. 只要物体振动,就能听到声音
C. 回声是声音被障碍物反射而形成的
D. 声音的传播速度不受周围环境温度的影响
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举一反三:
[单选题]33. The young man was often seen _______, by the lake.
A. to draw
B. to drawing
C. draw
D. drew
[单选题]The music in the supermarket sounded so??____________ that I wanted to leave at once.
A. soft
B. wonderful
C. friendly
D. noisy
[单选题]29.
A. watch
B. watching
C. watchs
D. watches
[单选题]16.
A. ask for
B. instead of
C. except for
D. because of
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