The ____of AIDS has led to an expansion in research seeking a cure.
C
【句意】爱滋病的扩散使得人们做更多的研究工作去寻找治疗的方法。
【难点】proliferation意为“激增;扩散”;innovation意为“革新，创新”;selection意为“选择;选拔”;conviction意为“定罪，判罪”。
—Icametoyourofficeyesterdaymorning,butnobodywasin.
—Oh,we__________ameetinginthemeetingroom.
—Haveyoufinishedthework?
—Notyet,butnomatterhowharditis,we'llkeep___untilwemakeit.
Allofusknow,color-blindpeopleoftenfinditdifficultto__betweenblueandgreen.
____,sheledalifeofcompleteseclusion.