单项选择题

The system of exploration of moon by man has been ______.

A. cancelled
B. abolished
C. refused
D. rejected
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单项选择题
Artificial flowers are used for scientific as well as for ______ purpose.
A. delicious
B. definite
C. decent
D. decorative
单项选择题
Living in poverty, she sold for 1,000 dollars the ______ of her father's first works, which made him famous.
A. manuscript
B. document
C. file
D. duplicate
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