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補(bǔ)全短文
Although the researchers have only just made the technical details of the microscope public, it is already on sale. It is currently the size of a refrigerator and takes several minutes to scan a circuit, but Xiao and Schrag are working ________.
A、to take tiny chips we require
B、to making chips any smaller
C、to shrink it to the size of a desktop computer and cut the scanning time to 30 seconds
D、of conducting electricity
【正確答案】 C
【答案解析】 這部分所說的體積的減小和所需時(shí)間的縮短恰好與前半句中提到的冰箱大小的體積和所需數(shù)分鐘的時(shí)間形成了對(duì)比。即：目前它大約像冰箱那么大，而且要用幾分鐘掃描一個(gè)電路，但是他們正在努力使它縮小到臺(tái)式計(jì)算機(jī)那么大，把掃描時(shí)間縮短到30秒。
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