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补全短文

We can now watch electricity as it flows through even the tiniest circuits. By scanning（扫描） the magnetic field（磁场） generated as electric currents flow through objects， physicists have managed ________.

A.to picture the progress of the currents

B.of detecting a current as weak as 10 microamperes

C.to making chips any smaller

D.to scan microchips for faults

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