Scientists across the world agree that this is an invention of great significance, inven

Scientists across the world agree that this is an invention of great significance, invention that will greatly change human life.
A. a; the
B. a; an
C. / ; the
D. / ; an

A. a; theB. a; anC. / ; the(答案→)D. / ; an解析：考查冠词。Of great significance,固定短语，意义重大的，介词后一般不加冠词。结合上文an invention一项发明，本句和前文为并列表语，泛指任何一项发明，故用不定冠词，词首音素为元音，故选D。

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