单项选择题
In the event of any quarantinable disease breaking out during its currency，the certificate of pratique generally （）.
A.becomes null and void
B.remains effective
C.is to be extended
D.is to renewed
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A.Immigration Officer
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Masters of ocean-going ships must keep in mind that （） should be hoisted immediately if any quarantinable diseases be found．
A.the national flag
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I shall apply （） the extension of my Deratization Certificate．
A.to
B.for
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