In the mountain areas, people are still struggling against lots of (difficult) _

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问题 In the mountain areas, people are still struggling against lots of (difficult) ________.

选项

答案 difficulties

解析此空前面为介词of，需要接名词作宾语，而且lots of表示“很多的”，是复数概念，所以of后的名词要用复数形式。因此，填入difficult的名词复数形式difficulties，意为“困难”。

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