单项选择题

Objectively set standards can serve as a ______for physicians, providing them ______unjustified malpractice claims.

A．trial...evidence of
B．model... experience with
C．criterion... reasons for
D．safeguard... protection from
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单项选择题
Although any destruction of vitamins caused by food irradiation could be______ the use of diet supplements, there may be no protection from carcinogens that some fear might be introduced into foods by the process.
A．counterbalanced by
B．attributed to
C．inferred from
D．augmented with
单项选择题
I'm afraid this painting is not by Picasso. It's only a copy and so it's______.
A．priceless
B．invaluable
C．unworthy
D．worthless
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