当用毛皮摩擦过的橡胶棒靠近一悬挂的通草球时，发现通草球向橡胶

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问题选择题

当用毛皮摩擦过的橡胶棒靠近一悬挂的通草球时，发现通草球向橡胶棒靠近，由此可以断定：[ ]

A.通草球带正电

B.通草球带负电

C.通草球不带电

D.无法确定通草球是否带电

答案

答案：D

阅读理解

阅读短文，判断正(√)误(×)。

Hello, my name is Lucy. I'm a girl. I'm ten years old. Today I eat porridge for breakfast. But my favourite

food is fish. And my favourite clothes is dress. I like pink dress. On Sundays, I like to play basketball with my

father and mother. At school, my favourite school work is writing stories. My friend is Betty. She likes to write

stories, too. We are the same.

( ) 1. Today I eat noodles for breakfast.

( ) 2. Lucy's favourite clothes is skirt.

( ) 3. I like to play ping-pong with my father and mother.

( ) 4. Betty likes to read books.

( ) 5. Lucy and Betty are friends.

( ) 6. Betty is ten years old.

填空题

电空阀线圈在无电状态下，若主气阀口处于关闭位置，称为（）电空阀。