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【单选题】
下列关于单模光纤的描述正确的是（）。A.
单模光纤传输距离比多模光纤短
B.
单模光纤的直径一般比多模光纤小
C.
单模光纤的成本比多模光纤的成本低
D.
光在单模光纤中通过内部反射来传输
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【简答题】“瞧他高兴得 ......”中 ,说话人可以省略“得”后 的内容,但仍能 被 听话人理解,这 是由于 ( )语境的 补足作用。
【单选题】Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.
A.
are to challenge
B.
have challenged
C.
are challenging
D.
have been challenged
【单选题】Jane tried to keep up a calm appearance, but her trembling voice ________.
A.
gave her up
B.
gave her away
C.
gave her in
D.
gave her out
【单选题】Jane tried to keep up a calm appearance, but her trembling voice let her out.
A.
showed her off
B.
snapped her up
C.
gave her away
D.
gave her out
【单选题】Great as Newton was, many of his ideas ___________ today and Great as Newton was, many of his ideas ___________ today and are being modified by the work of scientists of our time.
A.
are to challenge
B.
have been challenged
C.
may be challenged
D.
are challenging
【单选题】Jane tried to keep up a calm appearance, but her trembling voice ________. [ ]
A.
gave her away
B.
gave her out
C.
gave her in
D.
gave her up
【单选题】Jane tried to keep up a calm appearance, but her trembling voice ________ her _______.
A.
gave; in
B.
gave; out
C.
gave; up
D.
gave; away
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