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问题 解答题

现有84根萝卜，平均分给4个小白兔，每人分几个？

答案

84÷4=21（个）

阅读理解
任务型阅读。从方框中选择恰当的句子补全短文。
     Did you sleep all day on March 21?   1     This is the day of the year when
people around the world care about their sleep and ask themselves a lot of
questions about sleep.
     Why do we need sleep?    2   However, tests have shown that a lack(缺乏)
of sleep for over four weeks may cause a strong drop of body temperature,
great weight loss, and finally sickness.
        3  Eight hours a night is the average amount of sleep people need. Primary
schoolstudents need to sleep for about ten hours. Junior high school students
should sleep for about ninehours and senior high school students should sleep
for about eight hours.
        4    Thomas Edison said that sleep was a waste of time.  He didn't sleep
during the night.  But he took naps (小睡;打盹)  during the day.  On the other
hand,    5    
A. Nobody can answer this question well.  
B. Different people need different amounts of sleep.  
C. Albert Einstein said he needed to sleep for at least ten hours a night.  
D. There are so many people that do not care about their sleep.  
E. You should have done so because it was World Sleeping Day.
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填空题

两个相似三角形的相似比为2：3，则它们的面积之比为______．
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