______ of this Deratting Exemption Certificate is hereby extended until 4th Oct.2008 as the vessel is laden with cargo.
A.
Validity
B.
Valid
C.
Validation
D.
The coming into force
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举一反三
【单选题】In order to make the object to be explained more specific and vivid, it is possible to make a description of the object, which is called_______.( )