单项选择题

The construction of () and theories reflects the scientists’ interpretation of what has been observed.

A. prototypes
B. hypotheses
C. fantasies
D. imaginations

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单项选择题
41()

A.profitable
B.promising
C.prompt
D.progressive
单项选择题
A network of miniature toxin detectors has been () in 30 American cities for the sake of bio-security.

A. deployed
B. committed
C. indulged
D. immersed
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