试题与答案

在下列横线上填入适当的话语,使对话完整、正确。(共5小题,每小题3分,满分15分

题型:填空题

题目:

在下列横线上填入适当的话语,使对话完整、正确。(共5小题,每小题3分,满分15分)

(It’s Friday today. Bob and Dave are talking about their weekend plans. )

Bob:  Dave, the radio says it is sunny tomorrow. Do you have any plans?

Dave:        76      . I want to go to the beach. What are you going to do?

Bob: I’m going to do some sports.

Dave:        77      ?

Bob: I like basketball best. I think it can help me grow taller.

Dave:        78      ?

Bob: I will play it in the gym. By the way, who will you go to the beach with?

Dave: I’ll go with my parents.

Bob:       79     ?

Dave: We will go there by car.

Bob: Have a good time.

Dave:       80      .

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:依题意,每个点电荷在O点产生的场强为,则当N点处的点电荷移至P点时,O点场强如图所示,合场强大小为,则,故选B,考点:点评:电场强度为矢量,在求合场强时应先分别求得各电荷在O点的场强再由...

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