单项选择题

As one of the youngest professors in the university, Longfellow is certainly on the ______ of a brilliant career.

[A] porch
[B] edge
[C] threshold
[D] fringe

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单项选择题

There should be room for programs of world news within children's ______ .

[A] range
[B] scope
[C] room
[D] sight

单项选择题

It really ______ to witness such an enormity can occur in the so-called civilized society.

[A] pains her
[B] makes her pain
[C] is paining
[D] is pained

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