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。