一次家庭探究活动中，小明把一个正在发光的灯泡放到U形磁体中间，惊讶的发现了灯丝在晃动．关于这种现象，下列说法正确的是（　　）

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据《东京梦华录》等记载，宋代都城多见“当街列床凳，堆垛冰雪”出售凉食和专向客商出租铺席宅舍等现象。这反映了（     ）

请根据句意，选择合适的单词，并用其适当的形式填空。
far     die     peace     distant     we 
What’s the____ between your home and your school?
Who jumps ____ of the four students?
When we have problems,we shouldn’t keep our worries to ____ .
Hepburn passed away____ in her sleep.
In the film,a rich man was found____ in his house.
请选用动词的正确信形式填空。
direct     watch     quarrel   be     open 
I was writing a letter while he____ TV last night.
——-Where is Tom?He’s wanted on the phone.——He____ with his sister in the next room.
I’d rather ____ a director than an actress.
So far,Feng Xiaogang ____ many wonderful films.
A black cat ran into my room as I the door.

和谐的师生关系可以让我们的学习生活充满欢乐。但师生交往的过程中有时也会产生一些隔阂。这些隔阂产生的原因是（   ）