关于力和运动的关系，下列哪句话是正确的（） A．力与物体

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问题多选题

关于力和运动的关系，下列哪句话是正确的（　　）

A．力与物体运动无关

B．力是维持物体运动的原因

C．力是改变物体运动状态的原因

D．力是物体获得速度的原因

答案

A、物体的运动不需要力来维持，力与物体运动无关，故A正确，B错误

C、力是改变物体运动状态的原因．故C正确

D、物体的运动不需要力来维持，故D错误

故选AC．

情景交际

完成对话。

N= Nicola A= Annie

N: Hi, Annie. Did you have a good holiday?

A: Oh, yeah, I had a great (1)t ______ . But I've to tell you --- the most amazing thing happened.

N: (2) R_____? What was that?

A: Well, I was swimming in the sea and a huge wave came along and (3)k _____ my sunglasses into

the water. I …

N: Why were you swimming in the sunglasses?

A: Oh, I don't know. I'd just (4)l _____ them on top of my head. I'd forgotten they were there. Anyway,

they were (5)g_____. I was very upset. You know they were quite expensive.

N: I remember - (6)n _____ 100 pounds.

A: Yeah. Anyway, the next day I was lying on the beach, sunbathing. Then suddenly another huge wave…

N: Are you (7)s _____ this was a good holiday?

A: Yeah-but listen! When I looked down, there on the sand, (8)r ___ next to me , were my sunglasses.

I couldn't (9)b___ my eyes!

N: You're (10)j ____ ! That is amazing!

填空题

在双因素理论中，与工作的外部环境有关的因素为（）。