问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B