单项选择题

Absorbed in her work, she was totally ______ her surroundings.

A．liable for
B．separated by
C．oblivious of
D．concerned about

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单项选择题

While researchers may not ______ the expansive claims of hard-core vitamin enthusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.

A．authorize
B．license
C．counteract
D．endorse

单项选择题

This park has more than 200 waterfalls that are 15 feet or higher. And 150 of them have never been mapped or photographed, says park historian Lee Whittlesey. Now that's a ______ to the size of Yellowstone.

A．proposition
B．hypothesis
C．ceremony
D．testimony

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