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補全短文：
Gang Xiao and Ben Schrag at Brown University,visualize the current by measuring subtle（細微的)changes in the magnetic field of an object and ________.
A.to shrink it to the size of a desktop computer
B.to make it capable of measuring very weak changes in magnetic fields
C.as well as revealing microscopic defects in anything from aircraft to banknotes
D.converting the information into a color picture showing the density of current at each point
正確答案：D
答案解析：空格前的by在句中引導(dǎo)兩個在句法結(jié)構(gòu)上并列的分詞短語：一個是measuring subtle （細微的) changes in the magnetic field of an object；另一個就是converting the information into…，即：通過測量一個物體的磁場內(nèi)的細微變化和把信息轉(zhuǎn)化成顯示每一點電流強度的彩色圖片而使電流顯現(xiàn)。
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