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。
TheNobelPrizeCommitteehighlypraised()for“hispowerfulstyle-formingmasteryoftheart”ofcreatingmodernfiction.
The attitude towards life that( )had been trying to demonstrate in his works is known as “grace under pressure ”.
Hemingway’s “Indian Camp ” is one of the fourteen short stories collected under the title of( ).This title is very ironic because there is no peace at all in the stories.
Now many major employers are beginning to demand _______ the completion of school
At the age of eighty -seven,( )read his poetry at the inauguration of President John in 1961.
