问答题

Passage 1 Questions 25 to 27 are based on the passage you have just heard.

【参考答案】

[听力原文]25-27 By 1862 telegraph communications linked San Fran......

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问答题

A．On the first day of class.B．At the end of the first week of classes.C．Halfway through the semester.D．Just before the final examination.

填空题

将did改为do。

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