将电视机遥控器对准墙壁按一下开关,有时也可以将关闭的电视机打开。产生这种现象的原因是:A.可见光不遵从光的反射定律; B.不可见光的折射现象;C.不可见光的反射现象; D.凸透镜对光的会聚作用. 答案:C读对话,根据对话内容判断下列句子与对话的内容是否相符,用“√”或“×”表示。Sally: May is coming and we'll have a three-day holiday. What will you do? Betty: I'll stay at home and play the violin. Sally: Play the violin for three days? Betty: No. I'll also visit some friends. Sally: Won't you take a trip to Shanghai? Betty: No, I won't. Because there will be too many people in Shanghai. What will you do, Sally? Sally: I'll go skating. Do you like any sports? Betty: No. I don't. But I like music.I can play the violin well. I'll play it for the competition on June l. ( ) 1. They will have a three-day holiday from June l. ( ) 2. Betty will play the violin on May Day holiday. ( ) 3. Betty will visit some friends on holiday. ( ) 4. Sally will take a trip to Shanghai. ( ) 5. Sally will go skating.( ) 6. The violin competition will be on May l.