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  3. The most crucial issue at present is how to solve the problem of food safety.A:n

The most crucial issue at present is how to solve the problem of food safety.A:n

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问题 The most crucial issue at present is how to solve the problem of food safety.
选项 A:necessary       
B:important
C:demanding       
D:urgent
答案B
解析本句意思：“目前最关键的问题是如何解决食品安全的问题。" important: 重要的。例如：He is the most important person in decision making．他是决策中最为重要的人物。 necessary：必要的、必需的。例如：It is necessary to deal with the serious problem now．有必要处理这个严重的问题了。demanding：苛求的、要求高的。例如：This is a demanding profession.这个职业要求很高。urgent：紧迫的、紧要的。例如：It is urgent that you all present．要紧的是，你们必须全部到场。
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