单项选择题

Since there is no ______ , why don't we work on it now

A．option
B．duty
C．obligation
D．penalty
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单项选择题
He'd like to buy a house on the top of the hill as he likes the ______ of the se
A． perspectiveB. viewC. landscapeD. scene
单项选择题
Scientists first ______ the idea of the atomic bomb in the 1930s.
A．conserved
B．conceived
C．converted
D．contrived
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