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
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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 needn' t worry about radiation damage
单项选择题
The best title for this passage would be______.
A．The Atmosphere and Our Environment
B．Research on Radiation
C．Effects of Space Radiation
D．Importance of Protection Against Radiation
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