单项选择题

Previous research has established the lupine wolf as the______of the modern canine, but when and where humans first domesticated the former into the latter remains unclear.（）

A、 competitor
B、 ally
C、 scion
D、 prey
E、 progenitor

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单项选择题

Politicians and pollsters alike warn that the outcome of a presidential race remains ______until Election Day itself, and many races depend on factors that run from bad weather______voter turnout to last-minute scandals.（）

A、 unknown… abetting
B、 unlikely… decreasing
C、 fluid… affecting
D、 predetermined … consolidating
E、 fixed… absorbing

单项选择题

Except in times of______, we would scarcely allow public officials to declare states of emergency that replace some normal rules with those more______to extraordinary circumstances.（）

A、 debate… diffident
B、 serenity … indifferent
C、 catastrophe… germane
D、 obedience … ill-suited
E、 disaster… hostile

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