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18.如今人们非常关注的是食品安全和空气质量.(concern)Nowadays what people are (very) much concerned about is food safety andair quality.
Food safety and air quality are people's major concerns nowadays..

分析 Nowadays what people are (very) much concerned about is food safety and air quality.
Food safety and air quality are people's major concerns nowadays.

解答 Nowadays what people are (very) much concerned about is food safety and air quality.
Food safety and air quality are people's major concerns nowadays.
本句是对事物的一种看法,所以用一般现在时.
本句可用一个主语从句或者一个主系表的简单句表述都可以.what people are (very) much concerned about为一主语从句;major主要的,重要的.

点评 可以结合句意及括号中的提示词来选择合适的句型,适当使用复合句对于提升句子的品味很重要.

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