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问题 解答题

一个等腰三角形，它的顶角和一个底角数的比是5：2，这个等腰三角形的顶角是______度．

答案

5+2+2=9，

顶角为：180°×

5
9
=100°，

答：这个等腰三角形的顶角是100度；

故答案为：100．

填空题

用used to或一般现在时完成句子。

1. I used to play tennis. I stopped playing a few years ago.  

2. Do you do any sport? Yes, I play basketball.  

3. “Have you got a car?” “No, I _______________ one but I sold it.”  

4. George _______________ a waiter. Now he’s the manager of a hotel.  

5. “Do you go to work by car?” “Sometimes but most days I_______________ by train.”  

6. When I was a child, I never _______________ meat, but I eat it now.  

7. Mary loves watching TV. She  _______________ TV every evening.  

8. We _______________ near the airport but we moved to the city centre a few years ago.  

9. Normally I start work at 7 o’clock, so I _______________ up very early.  

10. What games __________ you _______________ when you were a child?
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选择题

称取9.3克部分变质的NaOH固体（含杂质Na2CO3）放入烧杯中，然后逐滴加入溶质质量分数为10%的稀盐酸至溶液的pH=7，共消耗了73克稀盐酸．此时溶液中溶质的质量为（　　）

A．5.85g

B．11.7g

C．13.6g

D．无法计算
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