问题
选择题
如图所示的电路中，闭合开关，滑动变阻器滑片向右滑动的过程中
A.灯泡
变亮、
亮度不变
B.灯泡
变亮、
变暗
C.灯泡
亮度不变、
变亮
D.灯泡
变暗、变亮
答案
答案：D
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如图所示的电路中，闭合开关，滑动变阻器滑片向右滑动的过程中
A.灯泡变亮、亮度不变
B.灯泡变亮、变暗
C.灯泡亮度不变、变亮
D.灯泡变暗、变亮
答案：D
Do you know? There is one language ____ in every country in the world. People, young or old, short or tall, thin or fat, use it very often. It is everybody’s second ____ . It is very easy to ___, though you can’t hear it. It is a sign language. When you wave(挥手) to a friend on the street, you are ____sign language. When you ___ up your hand in class, you are saying, “Please ask me, I think I know the answer,” or “I have some questions to ____.” When you smile at someone, you mean to be ____to him. When you put your forefinger(食指) in front of your mouth, you mean, “___ quiet, please.” When a policeman wants to ___cars or buses, he raises his right arm. Sign language is very useful in quiet places or places ___ of noise. It is different from body language.
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