单项选择题

The（）stuck on the envelope says "By Air".

A. diagram
B. label
C. signal
D. mark

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单项选择题

A full（）of all the reasons for and against closing the railway has begun

A. explosion
B. exploration
C. exploitation
D. explanation

单项选择题

The semantic ______ of ancient documents is not unique. Even in our own time, many documents are difficult to decipher.

A. aspect
B. pattern
C. opacity
D. intention

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