Intheoriginaltest，alltheanimalsinatestgrouparegivenasubstance_______halfofthemdie
A、unlessB
本题考查词义辨析。 until：直到。符合句意，表示 given a substance 持续到 half of them die 。
Somepersonsgaingoalanddirectionfromtheirtensions;others________underpressure.
OppositionleaderswillbewatchingcarefullytoseehowthePrimeMinister________thecrisis.
Intheoriginaltest，alltheanimalsinatestgrouparegivenasubstance_______halfofthemdie
RobertFrostisgenerallyconsideredaregionalpoetwhosesubjectmattersmainlyfocusonthelandscapeandpeoplein().
TheeffectofDarwinistideaof“survivalofthefittest”wasshatteringin()’sfictionalworldofjungle,where“killortobekilled”wasthelaw.
