单项选择题
For three-quarters of its span on Earth, life evolved almost ______ as microorganisms.
A.precisely
B.instantly
C. initially
D.exclusively
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单项选择题
Equipment not______ official safety standards has all been removed from the workshop.
A.conforming to
B.consistent with
C.predominant over
D.providing for
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单项选择题
My favorite radio song is the one I first heard on a thick 1923 Edison disc I______ at a garage sale.
A.trifled with
B.scraped through
C.stumbled upon
D.thirsted for
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