C919, The first large Chinese-made passenger airplane ______on its first flight in May last year.

A.took over B.took up C.took off D.took in

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A.with B.on C.to D.beyond

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A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

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