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A. that I didn't think of itB. I wonder what's wrong with the phone serviceC. it slipped my mindStudent: Excuse me. My phone hasn't worked since yesterday.1._____________Employee: What's your room number?Student: Room 456.Employee: Ah. Ellen McCully?Student: Yes, that's me.Employee: You didn't pay your phone bill for the past three months. Your service has been disconnected.Student: Really? I guess 2._____________. Why didn't I get any prior notice about the bill? I would have paid if I'd known.Employee: We sent four or five notices to your email.Student: Oh! I haven't been checking my email. I've been so busy with mid-terms 3._____________. Okay, what do I need to do to get my phone back on?Employee: You have to pay all of the bill. And there's a late penalty of forty dollars.Student: Forty dollars? Okay then.
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A.it gets its name from the man who invented itB. he lost his sight at the age of three as the result of an accidentC. another Frenchman had already come up with the idea of printing embossed lettersD. he invented his writing system at the age of only 15 in 1824Chairman: Now, Dr. Graycar, what is Braile and where does it get its name from?Dr. Graycar: Well, as you said, Braille is a system of writing used by and for people who cannot see. Er. 1._____________, the Frenchman Louis Braille who lived in the early 19th century.Chairman: Was Louis Braille actually blind himself?Dr. Graycar: Well… he wasn't born blind, but 2._____________in his father's workshop. Louis Braille then went to Paris to the National Institute for Blind Children and that's where 3._____________.while he was at the institute.Chairman: But he wasn't the first person to invent a system of touch reading for the blind, was he?Dr. Graycar: No, 4._____________that stood out from the paper but this was very cumbersome and inefficient.
【单选题】CO2气体保护焊用焊丝镀铜以后,既可防止生锈又可改善焊丝( )
【单选题】粗丝二氧化碳气体保护焊的焊丝直径为( )
【单选题】细丝二氧化碳保护焊时,熔滴应该采用( )过渡形式。
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