单项选择题

France's______ of nuclear testing in the South Pacific last month triggered political debates and mass demonstrations.

A．assumption
B．consumption
C．presumption
D．resumption
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单项选择题
Young scientists cannot realize______ soon that existing scientific knowledge is not nearly so complete, certain and unalterable as many textbooks seems to imply.
A．so
B．very
C．too
D．such
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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