In the original test，all the animals in a test group are given a substance _______ half of them die
A、unlessB
本题考查词义辨析。until：直到。符合句意，表示givenasubstance持续到halfofthemdie。
Nobodybutyou_______whathesaid.
()isgenerallyregardedastheforerunnerofthe20th—century“stream—of—consciousness”novelsandthefounderofpsychologicalrealism.
MarkTwain’sparticularconcernaboutthelocalcharacterofaregioncameaboutas“localcolorism,”auniquevariationofAmericanliterary().
Thatisthehouse_______youcanenjoythescenery.
TheAdventuresofTomSawyerand,especially,itssequence()provedthemselvestobethemilestoneintheAmericanliterature.
