18．You can’t go out and play __________ you’ve done your homework．

A．when　　　　　　　 B．since　　　　 C．while　　　　 D．until

17．一Whose exam paper is it?

　　 一It _________ be Li Lei’s．He always forgets to write his name on it．

A．can’t　　　　　　 B．can　　　　　 C．mustn’t　　　 D．must

16．The young man gave his life _______ the little boy，and everyone thought he was a real hero．

A．to saving　　　　　 B．save　　　　 C．saved　　　　 D．saving

15．Sally is leaving tomorrow，and we will go to the airport to _________．

A．see her off　　　 B．see off her　　　 C．pick her up　 D．pick up her

14．The basketball team played well，but they didn’t ________ the competition．

A．score　　　　　 B．beat　　　　　 C．fail　　　　　 D．win

13．We have to get up early tomorrow morning，_________ we will be late for the 6：30 train．

A．and　　　　　 B．or　　　　 　　C．if　　　　　 D．so

从下列各题所给的四个选项中，选择可以填人空白处的最佳选项。

12．Let’s make a cake for Tony．It’s _________ birthday today．

A．her　　　　　 B．hers　　　　　 C．his　　　　　 D．him

I．听对话。选择与对话内容相符的图片。每段对话读两遍。

Ⅱ．听对话和对话后的问题，选择最佳答案。每段对话读两遍。

4．Who does the man want to speak to?　　　　　　

　 A．Mary．　　　　　　　　 B．Betty．　　　　　　　 C．John

5．What will the man do next?

　 A．Stop playing the music．

　 B．Play the music more loudly．

　 C．Play with his friends．

6．How does Sam go to school on fine days?

　 A．By bus．　　　　　　　 B．On foot．　　　　　　 C．By bike

7．Why need the woman write down her personal information?

　 A．Because the hotel may return her watch．

　 B．Because she stayed in the hotel．

　 C．Because somebody has found her watch．

　 现在请听一段对话，完成第8至第9小题。

8．What are they talking about?

　 A．Places of interest．

　 B．Summer holiday．

　 C．Jerry’s mother．

9．Which is right according to the dialogue?

　 A．The woman will have a good time．　

　 B．The man will look after his mother．

　 C．The woman will be busy at home．

　 现在请听一段短文，完成第10至第11小题。

10．Who often plays football in the garden?

　 A．My children．

　 B．My neighbors’children．

　 C．Some strange children．

11．What happened when I was sleeping last Saturday?

　 A．A noise woke me up．

　 B．A boy opened my window．

　 C．A football broke my window．

现在请同学们翻到第II卷第一道大题。听短文，记录关键信息。

37、如图27所示，用滑轮组提升始终浸没在水中的物体A。已知定滑轮重4N，动滑轮重3N。物体A重8N，在拉力F=5N的作用下，物体A在水

中匀速上升。不计永的阻力、绳重和轴摩擦。求：

(1)物体A受到的浮力(要求画出受力分析图)；

(2)滑轮组的机械效率。　　

36．如图26所示的工件由A、B两个圆柱体构成。圆柱体A的高度是2cm、横截面积是

　　 40cm；圆柱体B的高度是10cm。制作工件的材料密度是4×10kg／m，设计要求A、B两部分的质量之比m：m=4：5。(1)求圆柱体B的横截面积S；(2)工件怎样放置对水平桌面的压强最小?计算出这个最小压强。