填空题

The Sabin vaccine was given most often on ______, but Koprowski’s vaccine was squirted into people’s mouths.

【参考答案】

a sugar cube
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填空题
Sabin and Koprowski created their vaccines by culturing a strain of polio virus on monkey kidneys, supposedly the source of ______, now called SIV.
单项选择题
A．One.B．Two.C．Three.D．Four.
A．One.
B．Two.
C．Three.
D．Four.
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