单项选择题

The fact that the golden eagle usually builds its nest on some high cliffs ______ it almost impossible to obtain the eggs or the young birds.

A．renders
B．reckons
C．regards
D．relates
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We were pleased to note that the early morning delivery didn't ______ to the traffic jam of the busy city.
A．aid
B．amount
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You don't have to install this radio in your new car; it's an ______ extra.
A．excessive
B．optional
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