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问题 单项选择题

具有结构相对简单、制造方便、使用可靠、维修容易、效率高、成本低等优点的焊条电弧焊电源是( )。

A．弧焊变压器

B．直流电源

C．弧焊整流器

D．逆变弧焊电源

答案

参考答案：A

选择题

How many apples are there ______________ the tree? [ ]

A. on

B. for

C. in
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完形填空
根据对话内容，从下面方框所给的选项中选出合适的句子补全对话，将其标号在答题卡上涂黑。

When do you usually go swimming ?
But it’s my favourite sport.
C. Do you like playing sports ?
D. What do you think of skiing ?
E. Becaues I think it’s more relaxing than other sports.

 
A: Hello, Ann.  小题1:      

B: Yes, I do. And I like swimming best.
A:   小题2:      
B: On Sundays and during summer holidays.
A:    小题3:       
B: I think it’s more dangerous than swimming.
A:   小题4:   
B: Why do you like it?
A:   小题5:      
B:What other sports do you like?
A: Table tennis and running.
B:Oh, I like running, too. Let’s run .Ok?
A: It sounds like a good idea.
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