单选题It is quite（）for an SES operator to send a distress alert.Aeasy and expensiveBsimple and certainCdangerous and stableDdifficult and compulsory
单选题
It is quite（）for an SES operator to send a distress alert.
A
easy and expensive
B
simple and certain
C
dangerous and stable
D
difficult and compulsory
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