In the original test，all the animals in a test group are given a substance _______ half of them die
B
本题考查词义辨析。until：直到。符合句意，表示givenasubstance持续到halfofthemdie。
Inmostofhiswritings,()deliberatelybrokeupthechronologyofhisnarrativebyjuxtaposingthepastwiththepresent,inthewaythemontagedoesinamovie.
TheNobelPrizeCommitteehighlypraised()for“hispowerfulstyle-formingmasteryoftheart”ofcreatingmodernfiction.
Theteachertoldusthefact_______.
Thistypeofdeskandchaircanbeadjusted________theheightofstudentsatdifferentages
Attheageofeighty-seven,()readhispoetryattheinaugurationofPresidentJohnin1961.