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
One third of the Chinese in the U.S. live in California, ______ in San Francisco.
A．dominantly
B．perpetually
C．predominantly
D．practically
单项选择题
We should hand down a cultural ______ to our offspring.
A．morality
B．heritage
C．liability
D．mortgage
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