单项选择题

Melting snow______ the regular spring floods in the valley.

A．lends itself to
B．works out
C．throws light on
D．accounts for
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单项选择题
He forgave his wife although she had once had a ______affair with a poet.
A．ruthless
B．transient
C．evil
D．remarkable
单项选择题
Decisions could be made on the basis of price, delivery dates, after-sales service or any other______.
A．variable
B．variance
C．variant
D．variation
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