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5. Where are the two speakers going?

A. To a birthday party.     B. To a department store.      C. To Lily’s school.

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4. What does the woman want the man to do?

A. To go to Alice’s birthday party with her.              

B. To tell her when Alice’s birthday is.      

C. To buy her a birthday present.

Conversation 3

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3. When is the woman’s birthday?

A. Tomorrow.        B. The day after tomorrow.     C. In two weeks.

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2. What can we learn from the conversation?

A. The man’s brother speaks very good Chinese.         

B .The man wants to learn some Chinese. 

C. The woman is learning Chinese.

Conversation 2

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1. What is in the man’s hand?

A. An old English-Chinese dictionary.             

B. A new English-Chinese dictionary.  .   

C. A new Chinese-English dictionary.            

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8.如图所示,光滑斜面长为a,宽为b,倾角为θ。一物块沿斜面上方顶点P水平射入,而从右下方顶点Q离开斜面,求物块入射的初速度为多少?

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7.在离地面高为h,离竖直光滑墙的水平距离为s1处,有一小球以v0的速度向墙水平抛出,如图所示。小球与墙碰撞后落地,不计碰撞过程中的能量损失,也不考虑碰撞的时间,则落地点到墙的距离s2为多少?

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6. 如图所示,点光源S距墙MN的水平距离为L,现从O处以水平速度v0平抛一小球PP在墙上形成的影是P',在球做平抛运动过程中,其影P'的运动速度是多大?

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5.飞机以恒定的速度v沿水平方向飞行,高度为2000m。在飞行过程中释放一枚炸弹,经过30s后飞行员听见炸弹落地的爆炸声。假设此爆炸向空间各个方向的传播速度都为330m/s,炸弹受到的空气阻力可以忽略,求该飞机的飞行速度v

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4.如图所示,飞机离地面高度为H=500m,水平飞行速度为v1=100m/s,追击一辆速度为v2=20 m/s同向行驶的汽车,欲使炸弹击中汽车,飞机应在距离汽车的水平距离多远处投弹?(g=10m/s2)

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