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amera picks up light from the scene. It changes this light into an electric signal called the video signal. A microphone changes the sound of people talking or music playing into an electric signal called the audio signal. 初二優(yōu)秀英語(yǔ)演講稿3分鐘篇3 Good morning, everyone! My name is xxxx. Iamp。rsquo。m a student of Great 7 from xxxmiddle school. I amp。rsquo。m very glad to stand here and give you a short speech today. My topic is “。I love English”。. English is now used everywhere in the world. It has bee the most mon language on Internet and for international trade. More and more people has begun to learn English now . As for me, I love English soon when I began to learn it. I find the great beauty of English language from English songs, English stori