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【多选题】
关于光纤的应用，下列说法正确的是（ ）。A.
G．652主要在海底光缆中
B.
G．653主要在日本等
C.
G．654在我国干线网中大量应用
D.
G．655主要在DWDM系统中
E.
G．657主要在接入网中
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举一反三
【单选题】John plays the piano _____, if not better than, David. But he never shows off in public.
A.
as well
B.
as well as
C.
so well
D.
so well as
【单选题】一Why is John so poor at his lessons? 一He never studies ，he plays computer games all day
A.
However
B.
Except
C.
Instead
D.
Anyway
【简答题】—Is the man our sales-manager? —No,it _________ not be him.He never plays cards. A．must B．can C．will D．may
【单选题】He never plays sports or does outdoor activities with his family.
A.
很少
B.
经常
C.
从不
D.
偶尔
【单选题】Faced with a bill for $10,000，________.
A.
an extra job has been given to John
B.
the boss has given John an extra job
C.
an extra job has been taken
D.
John has taken an extra job
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