单项选择题

A bone marrow test, (what) (involves) extracting fluid from the marrow, (maybe) necessary (for diagnosing) leukemi

A． whatB. involvesC. maybeD. for diagnosing
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单项选择题
(Looker - one) can get (a) better view (of) the game than the (participants).
A．Looker-one
B．a
C．of
D．participants
单项选择题
(Writing) in a terse, lucid style, the book (describes) the (author's) childhood experiences in Louisiana (just before) the outbreak of the Civil War.
A．Writing
B．describes
C．author’s
D．just before
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