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

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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

解析句意：目前最关键的问题是如何解决食品安全的问题。important意为“重要的”；necessary意为“必要的、必需的”；demanding意为“苛求的、要求高的”；urgent意为“紧迫的、紧要的”；crucial意为“关键的,重要的”，只有B与其意思相近。

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