【題目】It is reported that the disease is spreading, and all children under five are at (risk).

【答案】risk
【解析】句意：據(jù)報道疾病在蔓延，五歲以下的孩子處境危險。at risk固定短語，“處境危險”，risk用單數(shù)形式，前面也不用冠詞。故填risk。

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