单项选择题

Remember to ask for a（）of quality for the consumer goods; otherwise they will not of- fer any maintenance.

A. certificate
B. mark
C. warranty
D. receipt

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单项选择题
The（）stuck on the envelope says By Air .

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