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
【答案解析】 manage to V.是“设法做成”的意思。picture在此是动词，“to picture the progress of the currents”意思是“绘出电流运行图”。即：物理学家们通过扫描电流通过物体时产生的磁场而绘出电流运行图。