As Europe's economy has 【soured】,free-market ideas that are new

As Europe's economy has 【soured】,free-market ideas that are new to much of Europe face new challenges.
A、increased
B、decline
C、skyrocketed
D、tasted
【正确答案】：B
【题目解析】：句意：由于欧洲的经济已经恶化，对欧洲大部分地区来说都还崭新的自由市场思想面临着新的挑成。sour在句中的意思是“恶化”。选项中increase意为“增加”；decline意为“下降，衰退”;skyrocket意为“飞涨”;taste意为“体验”。故本题选B。