The______conditions and places are likely to cause diseases.

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问题 The______conditions and places are likely to cause diseases.

选项 A、unsanitary
B、insidious
C、insane
D、inefficacious

答案A

解析 句意:不卫生的条件和地方容易导致疾病。unsanitary不卫生的,有害健康的。insidious潜在的,暗中为害的。insane精神失常的,疯狂的。inefficacious无效力的,无用的
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