ThomasAlvaEdisondidn’tinventth

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Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.

A．improved upon

B．take down

C．put up

D．break away

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His latest research is at theof genetic science.

A．maiden voyage	B．cutting edge
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—Does it make anywhen to start?
—Yes, It matters a great deal.

A．money

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their great efforts, our planwell.

A．Compared to；worked	B．Due to；was working
C．Thanks to；worked	D．In addition to；was worked

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The decision has been made and I have got toit.

A．stand in

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