题干
The new discovery of oil is of great ______ to this area's economy.
A：performance
B：significance
C：satisfaction
D：assumption
答案(点此获取答案解析）
B
The new discovery of oil is of great ______ to this area's economy.
A：performance
B：significance
C：satisfaction
D：assumption
K2S+N2↑+3X↑，则下列说法正确的是（ ）
