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The new smart structures could be very expensive to build. However, that would save many lives and would be less likely to be damaged during earthquakes.
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The smart buildings discussed in the passage ________.
A. would cause serious financial problems
B. would be worthwhile though costly
C. would increase the complexity of architectural design
D. can reduce the ground vibrations caused by earthquakes
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... In 1862 Congress authorized two western railroad companies to build lines ... Actual work on this project began four years later ... In 1869 they met at a place called Promontory ...
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The author uses the example of the robot in space exploration to tell us ________.
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B. the reason why men need to sleep
C. about the need for robots to save power
D. about the danger of men working at night
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