单项选择题

Our visual perception depends on the reception of energy reflecting or radiating from（）which we wish to perceive.

A. it
B. these
C. that
D. those

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单项选择题
He（）that he has discovered a new planet.

A. permits
B. claims
C. classifies
D. confesses
单项选择题
Laura, who comes from a wealthy family, spends most of her time enjoying herself, but takes （）pains with her lessons.

A. little
B. few
C. a little
D. a few
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