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)______.

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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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