单选题:The author concludes that historical changes would ________

题目内容:
The author concludes that historical changes would ________ A.be delayed without leaders with inspiring personal qualities
B.not happen without heroes making the necessary sacrifices
C.take place if there were heroes to lead the people
D.produce leaders with attractive personalities
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答案解析:

原生演替的速度比次生演替的速度(  )

原生演替的速度比次生演替的速度(  )A.快 B.慢 C.相等 D.依具体情况而定

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处置突发性公共事件的首要原则是(  )。

处置突发性公共事件的首要原则是(  )。

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New drivers are far more __________ to have accidents than e

New drivers are far more __________ to have accidents than experienced drivers.

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记忆一份材料时,中间部分的记忆效果优于开始和末尾部分,这种现象称为系列位置效应。(  )

记忆一份材料时,中间部分的记忆效果优于开始和末尾部分,这种现象称为系列位置效应。(  )

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设四阶方阵A的特征值是2,3,4,5,对应的特征向量依,令则(  )

设四阶方阵A的特征值是2,3,4,5,对应的特征向量依,令则(  )A. B. C. D.

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