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.
A、slitheringB
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Cometsarestillregardedwithawebysomepeople.
Insect pests are among the leading causes of crop failure.
ThecompanyissuesanannualreporteveryMarch.
The future survival of the bald eagle is still an important American ecological concern.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
