单项选择题

If the additives are ______, the University of California researchers recommended caution in approving any alternatives.

A．postponed up
B．phased up
C．phrased up
D．phased out
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单项选择题
Based on their review, the University of California researchers concluded that MTBE is an animal virus ______ cause cancer in humans.
A．without doubt to
B．without question to
C．with the intention to
D．with the potential to
单项选择题
Conditions were ______ trees virtually disappeared from the inland, and 40% of Australia was transformed into a vast active dune field.
A．so far as that
B．so farther as to
C．so extreme that
D．so numerous that
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