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【单选题】
1970年代，光纤通信面临实用化挑战，关键技术问题是哪一个？A.
如何提高系统的传输容量
B.
如何制造出损耗足够低的传输媒质
C.
如何降低光纤制造的成本
D.
如何降低光纤通信系统的能耗
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反馈参考答案：
举一反三
【简答题】Many people know who wrote the song, but it seems none has any idea of who ________ the music. (填写画线词的近义词)
【简答题】在括号里填写画线词的近义词,使得句意完整,句法结构正确: Many people know who wrote the song, but it seems none has any idea of who ________ the music.
【简答题】预习《新视野大学英语3》读写教程Unit4 Section A课文及单词 2.写P95
【单选题】Tony runs fast; Jack runs ______ ; Tim runs ____.
A.
faster, fastest
B.
fast, fast
C.
fast, faster
D.
faster, faster
【单选题】Tom runs fast, but Jack runs .
A.
more fast
B.
much fast
C.
far more fast
D.
even faster
【单选题】Many people know who wrote the song, but none has any idea of who__________ the music.
A.
made
B.
composed
C.
composition
D.
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