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
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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