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Section A

A．Ways of getting extra credits.
B．All requirements of an M.A. degree.
C．The credit hours required for a degree.
D．Taking more optional courses.

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Monocular vision enables the kingfisher to

单项选择题

Blay Whitby pointed out that people only began to be aware of the safety issue ______.

A．when household robots were invented
B．when robots were in wide use
C．after some grave accidents
D．ten years or so ago

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