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。
In 1950,one of the leading American writers( )was awarded the Nobel Prize for the anti-racist Intruder in the Dust.
considered()“thetruefatherofournationalliterature”.
Nowmanymajoremployersarebeginningtodemand_______thecompletionofschool
The Adventures of Tom Sawyer and,especially,its sequence( )proved themselves to be the milestone in the American literature.
Which of the following statements is NOT true of Emily Dickinson and her poetry?
