单项选择题
Solid geometry has enabled astronomers to calculate the positions of the heavenly bodies______ to one another.
A.absolute
B.relative
C.comparative
D.contrastive
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单项选择题
Programmed instruction received its major impetus from the work of behaviorist J. H. Skinner, who after years of research,______ a practical system in 1954.
A.described
B.derived
C.imitated
D.devised
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单项选择题
After discussing the matter with the bank manager, Peter ______received his loan.
A.instantly
B.instinctively
C.casually
D.unexpectedly
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