单项选择题

A technologist can be compared to an artist because______.

A．they are both winners of awards
B．they are both experts in spatial thinking
C．they both abandon verbal description
D．they both use various instruments

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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 needn' t worry about radiation damage