Read and answer. (读一读，答一答)    

     Hi, I'm Joy. I went to Hainan on my holiday. I swam in the sea. I saw many beautiful fish there.

Bill went to Harbin on his holiday. He went ice-skating and ate good food with his friends. Andy

went to Australia last summer. He rowed a boat with his parents. He took many pictures there.    

1. Where did Joy go on his holiday?

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2. Did Joy see many beautiful fish there?

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3. Who went to Harbin?

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4. Where did Andy go on his holiday?

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在“用单摆测定重力加速度”的实验中

小题1:（单选）测量单摆的周期时，某同学在摆球某次通过最低点时，按下停表开始计时，同时数“1”，当摆球第二次通过最低点时数“2”，依此法往下数，当他数到“59”时，按表停止计时，读出这段时间t，则该单摆的周期为

A．t/29

B．t/29.5

C．t/30

D．t/59小题2:在该实验中，如果摆球质量分布不均匀，某同学于是设计了下面一种计算方法：第一次测量悬线长为L₁，测得周期为T₁；第二次测量悬线长为L₂，测得周期为T₂，由此可推算出重力加速度g＝__________．