单选题:People were confused in their attempts to control malaria in

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题目内容:
People were confused in their attempts to control malaria in Europe in the early 1900s.because scientists A.identified only one mosquito species instead of six species.
B.thought only three mosquito species transmitted disease.
C.thought there was only one mosquito species.
D.did not know what species was being studied.

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We have ample money for the journey.

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(1)在考生文件夹下有一个工程文件sjt3.vbp,在程序运行时,单击“输入整数”按钮,输入一个整数,并在窗体上显示此整数的所有不同因子和因子个数。图1是输入5

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在外部设备中,扫描仪属于(  )。

在外部设备中,扫描仪属于(  )。A.输出设备 B.存储设备 C.输入设备 D.特殊设备

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下列各存储器中,存取速度最快的一种是(  )。

下列各存储器中,存取速度最快的一种是(  )。A.u盘 B.内存储器 C.光盘 D.固定硬盘

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请根据短文内容,回答题。Einstein Named "Person of the Century"Albert Ein

请根据短文内容,回答题。Einstein Named "Person of the Century"Albert Einstein, whose theorie

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