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问题 填空题

力是______，力的三个要素是______，______和______．

答案

力是物体对物体的作用，力的三要素是大小、方向和作用点．

故答案为：物体对物体；大小；方向；作用点．

填空题

Here is my idea about how a friend is like. Firstly, 61.______a friend is someone you can share your secrets. If you 62.______tell him a secret, never will he talks about it with anybody 63.______else. Besides, a friend is always good listener when you 64.______need one. After hear your sad stories, he will say some 65.______words that is nice and warm. Still, your happiness makes 66.______him happily, too. What’s more, a good friend is willing to 67.______offer the help to which you need, or can at least give you 68.______some advices. In a word, friends are those you like and 69.______trust, and you will enjoy every minute that you spent with 70.______them.

69().
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单项选择题

下面属于警告标志的是（）

A、前方慢行

B、必须携带矿灯

C、当心片帮滑坡

D、禁止入内
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