GRE

简答题complete the text by picking the best entry for each blank from the corresponding column of choices.回答题：
Mercury is a(i) ___________of many scientificinstruments，but in recent times，concerns about its(ii) ___________have led to its replacement byequallyaccurate digital or alcohol-based substitutes．

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C，E．
If there were concerns about mercury’s precision(choice D)，the author would not call the other elements“equally accurate．”The choices here are straightforward．

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