问题
选择题
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
答案
答案:D
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。