They’re choosing a cautious policy in order to avoid a risk in such an important event.
A. thoroughly
B. deliberately
C. carelessly
D. naturally
网友回答
A. thoroughly
(答案→)B. deliberately
C. carelessly
D. naturally
解析：考查副词：A. thoroughly全面的，B. deliberately故意地，C. carelessly自信地，D. naturally自然地，句意：他们故意选一个谨慎的政策，为了避免在这样重要的事件中有危险。选B。