单项选择题

Although the heavy rain stopped, it was at least an hour later that the flood began to ______

A．retire
B．recede
C．recline
D．retreat
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单项选择题
Some American colleges are state-supported, others are privately _______, and still others are supported by religious organizations.
A．ensured
B．attributed
C．authorized
D．endowed
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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