单项选择题

It was in 1930s that scientists first ______ the idea of the atom bomb.

A．imagined
B．contemplated
C．reckoned
D．conceived
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单项选择题
It was felt that he lacked the ______ to pursue a difficult task to the very end.
A．engagement
B．persuasion
C．commitment
D．preservation
单项选择题
The ______ of energy and money on the launching of the rocket is surprising.
A．exhaustion
B．expenditure
C．allowance
D．ownership
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