单项选择题

Once a picture is proved to be a forgery, it becomes quite ______.

A. invaluable
B. priceless
C. unworthy
D. worthless
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单项选择题
His ideas are invariably condemned as ______ by his colleagues.
A. imaginative
B. ingenious
C. impractical
D. theoretical
单项选择题
The moon, being much nearer to the Earth than the Sun, is the ______ cause of the tides.
A. principal
B. basic
C. initial
D. elementary
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