阅读理解。

1. Sydney Tower is            in Sydney, Australia. 

A. the busiest street  

B. the biggest station  

C. the most beautiful park  

D. the highest point

2. If you Want to book(预订) a ticket to Sydney Tower, you can' t               . 

A. email sydneytower@ hotmail, com            

B. fax 02 9333 920

C. search www. sydneytower. com. au            

D. dial 02 9333 9222

3. Frank wants to go to Sydney Tower with his two children, he will pay             .

A. $60          

B.  $90          

C. $120        

D.  $150

4. Last Saturday, Johnson went to visit Sydney Tower. He had to get down the tower      .  

A. after 11:30 pm  

B. before 11:30 pm    

C. at 10:30 pm    

D. by 10:30 pm

5. The passage, above is probably                      .

A. a piece of news  

B. a conversation    

C. a story    

D. an advertisement

如图所示，倾角30⁰、高为L的固定斜面底端与水平面平滑相连，质量分别为3m、m的两个小球A、B用一根长为L的轻绳连接，A球置于斜面顶端。现由静止释放A、B两球，B球与弧形挡板碰撞过程时间极短无机械能损失，且碰后只能沿斜面下滑，两球最终均滑到水平面上。已知重力加速度为g，不计一切摩擦，则（     ）

A．A球刚滑至水平面时的速度大小为 

B．B球刚滑至水平面时的速度大小为

C．两小球在水平面上不可能相撞

D．在A球沿斜面下滑的过程中，轻绳对B球先做正功、后不做功