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问题 解答题
一批零件平均分给师徒两人去做．经过6小时，师傅完成了任务，这时徒弟还差96个没有完成．已知徒弟的工作效率是师傅的
4
5
，这批零件有多少个？
答案

96÷（1-

1
6
×
4
5
×6），

=96÷（1-

4
5
），

=96÷

1
5
，

=480（个）；

480×2=960（个）．

答：这批零件有960个．

填空题
用方框中所给单词的适当形式填空，使短文完整正确。（每个单词限用一次）
invent, by, fishing, hard, use, kite, up, to, special, name, one
       What's the most important invention of all the time? It's   l    to say, but we know that it may be
something right in front of your eyes.    
       In 1826,a Frenchman   2   Niepce needed picture for his business. But he wasn't a good artist. So
the    3   simple camera was invented by him.  He put“in a window of his house and took a picture of
his yard.    
       The kite was   4  in China, the fifth or fourth century BC. Kungshu Pan made   5   shaped like birds
which can fly for   6  three days, and Mo Li spent three years building a    7   kite. Kites were   8  in
wartime as early as 1232 when kites with messages were flown over Mongol（蒙古） lines  9  the
Chinese. The strings were cut and the kites landed among the Chinese prisoners(范人)，inciting(煽动)
them to struggle and escape. Kites fitted with hooks and bait（鱼饵）were used for  10  Trhe kite was
     invent  by  fishing  hard  use  kite  up to  special  name  one    What's the most important invention of all the time? It's   l    to say, but we know that it may be something right in front of your eyes.    In 1826,a Frenchman   2   Niepce needed picture for his business. But he wasn't a good artist. So the   3    simple camera was invented by him.  He put“in a window of his house and took a picture of his yard.    The kite was 4    in China, the fifth or fourth century BC. Kungshu Pan made5_____________shaped like birds which can fly for   6    three days, and Mo Li spent three years building a 7____kite. Kites were 8    in wartime as early as 1232 when kites with messages were flown over Mongol（蒙古） lines 9    the Chinese. The strings were cut and the kites landed among the Chinese prisoners(范人)，inciting(煽动)them to struggle and escape. Kites fitted with hooks and bait（鱼饵）were used for  10   Trhe kite was first mentioned in Europe in a popular book of wonders and tricks in 1589. first mentioned in Europe in a popular book of wonders and tricks in 1589.
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问答题

在观看铅球比赛时，如果你想借此探究“重力势能的大小与哪些因素有关”．

（1）你将选择哪些实验器材？

（2）写出实验步骤．

（3）说出实验中判断重力势能大小的方法．
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