问答题

（）isusedtofacilitatethewriter’sumberigadfiligofthelettersheorshereceives.

答案： Ref. o.

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I hope you will write to me long letters while you are away.

答案：错===对

Whichthematicprogressionpatternhasbeenusedinthisparagraph?_TheinventorofthediodevalvewasFleming.Hemadeuseofthefact,firstnoticedbyEdison,thatanelectriccurrentcouldbemadetoflowacrosstheemptyspacebetweenthehotfilamentofanelectriclampandanothermetalelectrodep

答案： simple linear progression