The megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
B
暂无解析
It'smore________tobuyaseasonticketifyoutraveleveryday.
新民主主义社会是_______。
“一化三改”中的“三改”是指对个体农业、手工业和资本主义工商业的社会主义改造。
五四时期，毛泽东参与发起的进步社团是()
Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).
