(A most) useful tool (for analyzing) the elemental (composition of fossils) is t

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问题 (A most) useful tool (for analyzing) the elemental (composition of fossils) is the electron probe, a (modify) electron microscope.

选项 A、A most
B、for analyzing
C、composition of fossils
D、modify

答案 D

解析

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(Amost)usefultool(foranalyzing)theelemental(compositionoffossils)ist