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The Importance of Extracurricular Activities The previous......

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单项选择题
According to the author, the great outburst of major inventions in early America was in a large part due to______.
A．elementally schools
B．enthusiastic workers
C．the attractive premium system
D．a special way of thinking
单项选择题
We know from the passage that ______.
A．exposure to even tiny amounts of radiation is fatal
B．the effect of exposure to radiation is slow in coming
C．radiation is avoidable in space exploration
D．astronauts in spacesuits need not worry about radiation damage
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